diff --git a/packages/babel-core/package.json b/packages/babel-core/package.json
index cf3deea3d9..02786a5df2 100644
--- a/packages/babel-core/package.json
+++ b/packages/babel-core/package.json
@@ -32,7 +32,7 @@
     "babel-template": "7.0.0-alpha.10",
     "babel-traverse": "7.0.0-alpha.10",
     "babel-types": "7.0.0-alpha.10",
-    "babylon": "7.0.0-beta.11",
+    "babylon": "7.0.0-beta.12",
     "convert-source-map": "^1.1.0",
     "debug": "^2.1.1",
     "json5": "^0.5.0",
diff --git a/packages/babel-generator/package.json b/packages/babel-generator/package.json
index a9a170f102..19f30e85ca 100644
--- a/packages/babel-generator/package.json
+++ b/packages/babel-generator/package.json
@@ -21,6 +21,6 @@
   },
   "devDependencies": {
     "babel-helper-fixtures": "7.0.0-alpha.10",
-    "babylon": "^7.0.0-beta.8"
+    "babylon": "^7.0.0-beta.12"
   }
 }
diff --git a/packages/babel-plugin-syntax-numeric-separator/.npmignore b/packages/babel-plugin-syntax-numeric-separator/.npmignore
new file mode 100644
index 0000000000..cace0d6ddc
--- /dev/null
+++ b/packages/babel-plugin-syntax-numeric-separator/.npmignore
@@ -0,0 +1,3 @@
+node_modules
+*.log
+src
diff --git a/packages/babel-plugin-syntax-numeric-separator/README.md b/packages/babel-plugin-syntax-numeric-separator/README.md
new file mode 100644
index 0000000000..02199eb42f
--- /dev/null
+++ b/packages/babel-plugin-syntax-numeric-separator/README.md
@@ -0,0 +1,36 @@
+# babel-plugin-syntax-numeric-separator
+
+> Allow parsing of Numeric Literals (Decimal, Binary, Hex and Octal) that contain a _NumericLiteralSeparator_.
+
+
+## Installation
+
+```sh
+npm install --save-dev babel-plugin-syntax-numeric-separator
+```
+
+## Usage
+
+### Via `.babelrc` (Recommended)
+
+**.babelrc**
+
+```json
+{
+  "plugins": ["syntax-numeric-separator"]
+}
+```
+
+### Via CLI
+
+```sh
+babel --plugins syntax-numeric-separator script.js
+```
+
+### Via Node API
+
+```javascript
+require("babel-core").transform("code", {
+  plugins: ["syntax-numeric-separator"]
+});
+```
diff --git a/packages/babel-plugin-syntax-numeric-separator/package.json b/packages/babel-plugin-syntax-numeric-separator/package.json
new file mode 100644
index 0000000000..312cb5c87d
--- /dev/null
+++ b/packages/babel-plugin-syntax-numeric-separator/package.json
@@ -0,0 +1,13 @@
+{
+  "name": "babel-plugin-syntax-numeric-separator",
+  "version": "7.0.0-alpha.12",
+  "description": "Allow parsing of Decimal, Binary, Hex and Octal literals that contain a Numeric Literal Separator",
+  "repository": "https://github.com/babel/babel/tree/master/packages/babel-plugin-syntax-numeric-separator",
+  "license": "MIT",
+  "main": "lib/index.js",
+  "keywords": [
+    "babel-plugin"
+  ],
+  "dependencies": {},
+  "devDependencies": {}
+}
diff --git a/packages/babel-plugin-syntax-numeric-separator/src/index.js b/packages/babel-plugin-syntax-numeric-separator/src/index.js
new file mode 100644
index 0000000000..751844a69b
--- /dev/null
+++ b/packages/babel-plugin-syntax-numeric-separator/src/index.js
@@ -0,0 +1,7 @@
+export default function () {
+  return {
+    manipulateOptions(opts, parserOpts) {
+      parserOpts.plugins.push("numericSeparator");
+    },
+  };
+}
diff --git a/packages/babel-plugin-transform-numeric-separator/.npmignore b/packages/babel-plugin-transform-numeric-separator/.npmignore
new file mode 100644
index 0000000000..f980694583
--- /dev/null
+++ b/packages/babel-plugin-transform-numeric-separator/.npmignore
@@ -0,0 +1,3 @@
+src
+test
+*.log
diff --git a/packages/babel-plugin-transform-numeric-separator/README.md b/packages/babel-plugin-transform-numeric-separator/README.md
new file mode 100644
index 0000000000..2b68ef2eaf
--- /dev/null
+++ b/packages/babel-plugin-transform-numeric-separator/README.md
@@ -0,0 +1,114 @@
+# babel-plugin-transform-numeric-separator
+
+> This plugin allows Babel to transform Decimal, Binary, Hex and Octal literals containing Numeric Literal Separator to their non-separated form.
+
+## Example
+
+### Decimal Literals
+
+```js
+let budget = 1_000_000_000_000;
+
+// What is the value of `budget`? It's 1 trillion!
+// 
+// Let's confirm:
+console.log(budget === 10 ** 12); // true
+```
+
+### Binary Literals
+
+```js
+let nibbles = 0b1010_0001_1000_0101;
+
+// Is bit 7 on? It sure is!
+// 0b1010_0001_1000_0101
+//             ^
+//             
+// We can double check: 
+console.log(!!(nibbles & (1 << 7))); // true
+```
+
+### Hex Literal
+
+```js
+// Messages are sent as 24 bit values, but should be 
+// treated as 3 distinct bytes:
+let message = 0xA0_B0_C0;
+
+// What's the value of the upper most byte? It's A0, or 160.
+// We can confirm that:
+let a = (message >> 16) & 0xFF; 
+console.log(a.toString(16), a); // a0, 160
+
+// What's the value of the middle byte? It's B0, or 176.
+// Let's just make sure...
+let b = (message >> 8) & 0xFF;
+console.log(b.toString(16), b); // b0, 176
+
+// What's the value of the lower most byte? It's C0, or 192.
+// Again, let's prove that:
+let c = message & 0xFF;
+console.log(c.toString(16), b); // c0, 192
+```
+
+### Octal Literal
+
+*hand wave emoji*
+
+Octals are great for permissions, but also look better when represented in `0o0000` form. No real benefit with separators here. 
+
+## Installation
+
+```sh
+npm install --save-dev babel-plugin-transform-numeric-separator
+```
+
+## Usage
+
+### Via `.babelrc` (Recommended)
+
+**.babelrc**
+
+```json
+{
+  "plugins": ["transform-numeric-separator"]
+}
+```
+
+### Via CLI
+
+```sh
+babel --plugins transform-numeric-separator script.js
+```
+
+### Via Node API
+
+```javascript
+require("babel-core").transform("code", {
+  plugins: ["transform-numeric-separator"]
+});
+```
+
+## Additional Information 
+
+If you need to further compile ES2015 Decimal, Binary, Hex and Octal number representations to their pre-ES2015 numeric literal form, add the [`"transform-es2015-literals"`](http://babeljs.io/docs/plugins/transform-es2015-literals/) plugin:
+
+> `transform-es2015-literals` is already included in [babel-preset-env](https://github.com/babel/babel-preset-env) and babel-preset-es2015.
+
+### Via `.babelrc` (Recommended)
+
+**.babelrc**
+
+```json
+{
+  "presets": ["env"],
+  "plugins": ["transform-numeric-separator"]
+}
+{
+  "plugins": ["transform-numeric-separator", "transform-es2015-literals"]
+}
+```
+
+## References
+
+* [Proposal: Numeric Separators](https://github.com/samuelgoto/proposal-numeric-separator)
diff --git a/packages/babel-plugin-transform-numeric-separator/package.json b/packages/babel-plugin-transform-numeric-separator/package.json
new file mode 100644
index 0000000000..e628810e6d
--- /dev/null
+++ b/packages/babel-plugin-transform-numeric-separator/package.json
@@ -0,0 +1,17 @@
+{
+  "name": "babel-plugin-transform-numeric-separator",
+  "version": "7.0.0-alpha.12",
+  "description": "Remove numeric separators from Decimal, Binary, Hex and Octal literals",
+  "repository": "https://github.com/babel/babel/tree/master/packages/babel-plugin-transform-numeric-separator",
+  "license": "MIT",
+  "main": "lib/index.js",
+  "keywords": [
+    "babel-plugin"
+  ],
+  "dependencies": {
+    "babel-plugin-syntax-numeric-separator": "7.0.0-alpha.12"
+  },
+  "devDependencies": {
+    "babel-helper-plugin-test-runner": "7.0.0-alpha.10"
+  }
+}
diff --git a/packages/babel-plugin-transform-numeric-separator/src/index.js b/packages/babel-plugin-transform-numeric-separator/src/index.js
new file mode 100644
index 0000000000..1b02b72ad0
--- /dev/null
+++ b/packages/babel-plugin-transform-numeric-separator/src/index.js
@@ -0,0 +1,31 @@
+import syntaxNumericSeparator from "babel-plugin-syntax-numeric-separator";
+
+export default function () {
+
+  function replacer(value) {
+    return value.replace(/_/g, "");
+  }
+
+  function replaceNumberArg({ node }) {
+    if (node.callee.name === "Number") {
+      node.arguments[0].value = replacer(node.arguments[0].value);
+    }
+  }
+
+  const CallExpression = replaceNumberArg;
+  const NewExpression = replaceNumberArg;
+
+  return {
+    inherits: syntaxNumericSeparator,
+
+    visitor: {
+      CallExpression,
+      NewExpression,
+      NumericLiteral({ node }) {
+        if (node.extra && /_/.test(node.extra.raw)) {
+          node.value = replacer(node.extra.raw);
+        }
+      },
+    },
+  };
+}
diff --git a/packages/babel-plugin-transform-numeric-separator/test/fixtures/number/exec.js b/packages/babel-plugin-transform-numeric-separator/test/fixtures/number/exec.js
new file mode 100644
index 0000000000..753b2855dc
--- /dev/null
+++ b/packages/babel-plugin-transform-numeric-separator/test/fixtures/number/exec.js
@@ -0,0 +1,9 @@
+assert.equal(Number("1_000"), Number("1000"));
+assert.equal(Number("0xAE_BE_CE"), Number("0xAEBECE"));
+assert.equal(Number("0b1010_0001_1000_0101"), Number("0b1010000110000101"));
+assert.equal(Number("0o0_6_6_6"), Number("0o0666"));
+
+assert.equal(new Number("1_000").valueOf(), new Number("1000").valueOf());
+assert.equal(new Number("0xAE_BE_CE").valueOf(), new Number("0xAEBECE").valueOf());
+assert.equal(new Number("0b1010_0001_1000_0101").valueOf(), new Number("0b1010000110000101").valueOf());
+assert.equal(new Number("0o0_6_6_6").valueOf(), new Number("0o0666").valueOf());
diff --git a/packages/babel-plugin-transform-numeric-separator/test/fixtures/number/options.json b/packages/babel-plugin-transform-numeric-separator/test/fixtures/number/options.json
new file mode 100644
index 0000000000..2ecd3a18a1
--- /dev/null
+++ b/packages/babel-plugin-transform-numeric-separator/test/fixtures/number/options.json
@@ -0,0 +1,3 @@
+{
+  "plugins": ["transform-numeric-separator"]
+}
diff --git a/packages/babel-plugin-transform-numeric-separator/test/fixtures/removal/exec.js b/packages/babel-plugin-transform-numeric-separator/test/fixtures/removal/exec.js
new file mode 100644
index 0000000000..2ccbbfbd9f
--- /dev/null
+++ b/packages/babel-plugin-transform-numeric-separator/test/fixtures/removal/exec.js
@@ -0,0 +1,4 @@
+assert.equal(1_000, 1000);
+assert.equal(0xAE_BE_CE, 0xAEBECE);
+assert.equal(0b1010_0001_1000_0101, 0b1010000110000101);
+assert.equal(0o0_6_6_6, 0o0666);
diff --git a/packages/babel-plugin-transform-numeric-separator/test/fixtures/removal/options.json b/packages/babel-plugin-transform-numeric-separator/test/fixtures/removal/options.json
new file mode 100644
index 0000000000..2ecd3a18a1
--- /dev/null
+++ b/packages/babel-plugin-transform-numeric-separator/test/fixtures/removal/options.json
@@ -0,0 +1,3 @@
+{
+  "plugins": ["transform-numeric-separator"]
+}
diff --git a/packages/babel-plugin-transform-numeric-separator/test/fixtures/used-with-transform-es2015-literals/actual.js b/packages/babel-plugin-transform-numeric-separator/test/fixtures/used-with-transform-es2015-literals/actual.js
new file mode 100644
index 0000000000..a9c770d8c2
--- /dev/null
+++ b/packages/babel-plugin-transform-numeric-separator/test/fixtures/used-with-transform-es2015-literals/actual.js
@@ -0,0 +1,4 @@
+1_000;
+0xA0_B0_C0;
+0b1010_0001_1000_0101;
+0o0_6_6_6;
diff --git a/packages/babel-plugin-transform-numeric-separator/test/fixtures/used-with-transform-es2015-literals/exec.js b/packages/babel-plugin-transform-numeric-separator/test/fixtures/used-with-transform-es2015-literals/exec.js
new file mode 100644
index 0000000000..6fe7659a0c
--- /dev/null
+++ b/packages/babel-plugin-transform-numeric-separator/test/fixtures/used-with-transform-es2015-literals/exec.js
@@ -0,0 +1,4 @@
+assert.equal(1_000, 1000);
+assert.equal(0xAE_BE_CE, 11452110);
+assert.equal(0b1010_0001_1000_0101, 41349);
+assert.equal(0o0_6_6_6, 438);
diff --git a/packages/babel-plugin-transform-numeric-separator/test/fixtures/used-with-transform-es2015-literals/expected.js b/packages/babel-plugin-transform-numeric-separator/test/fixtures/used-with-transform-es2015-literals/expected.js
new file mode 100644
index 0000000000..86dba506f9
--- /dev/null
+++ b/packages/babel-plugin-transform-numeric-separator/test/fixtures/used-with-transform-es2015-literals/expected.js
@@ -0,0 +1,4 @@
+1000;
+10531008;
+41349;
+438;
diff --git a/packages/babel-plugin-transform-numeric-separator/test/fixtures/used-with-transform-es2015-literals/options.json b/packages/babel-plugin-transform-numeric-separator/test/fixtures/used-with-transform-es2015-literals/options.json
new file mode 100644
index 0000000000..bf1d8be512
--- /dev/null
+++ b/packages/babel-plugin-transform-numeric-separator/test/fixtures/used-with-transform-es2015-literals/options.json
@@ -0,0 +1,3 @@
+{
+  "plugins": ["transform-numeric-separator", "transform-es2015-literals"]
+}
diff --git a/packages/babel-plugin-transform-numeric-separator/test/index.js b/packages/babel-plugin-transform-numeric-separator/test/index.js
new file mode 100644
index 0000000000..09cfbc31f5
--- /dev/null
+++ b/packages/babel-plugin-transform-numeric-separator/test/index.js
@@ -0,0 +1,3 @@
+import runner from "babel-helper-plugin-test-runner";
+
+runner(__dirname);
diff --git a/packages/babel-preset-stage-1/package.json b/packages/babel-preset-stage-1/package.json
index 4a4eec9c6d..dbcbd03470 100644
--- a/packages/babel-preset-stage-1/package.json
+++ b/packages/babel-preset-stage-1/package.json
@@ -8,6 +8,7 @@
   "repository": "https://github.com/babel/babel/tree/master/packages/babel-preset-stage-1",
   "main": "lib/index.js",
   "dependencies": {
+    "babel-plugin-syntax-numeric-separator": "7.0.0-alpha.12",
     "babel-plugin-transform-decorators": "7.0.0-alpha.10",
     "babel-plugin-transform-export-extensions": "7.0.0-alpha.10",
     "babel-preset-stage-2": "7.0.0-alpha.10"
diff --git a/packages/babel-preset-stage-1/src/index.js b/packages/babel-preset-stage-1/src/index.js
index 15000e690b..fd1be2d539 100644
--- a/packages/babel-preset-stage-1/src/index.js
+++ b/packages/babel-preset-stage-1/src/index.js
@@ -2,6 +2,7 @@ import presetStage2 from "babel-preset-stage-2";
 
 import transformDecorators from "babel-plugin-transform-decorators";
 import transformExportExtensions from "babel-plugin-transform-export-extensions";
+import transformNumericSeparator from "babel-plugin-transform-numeric-separator";
 
 export default function () {
   return {
@@ -11,6 +12,7 @@ export default function () {
     plugins: [
       transformDecorators,
       transformExportExtensions,
+      transformNumericSeparator,
     ],
   };
 }
diff --git a/packages/babel-template/package.json b/packages/babel-template/package.json
index db7b314ef9..77ed04e681 100644
--- a/packages/babel-template/package.json
+++ b/packages/babel-template/package.json
@@ -8,7 +8,7 @@
   "repository": "https://github.com/babel/babel/tree/master/packages/babel-template",
   "main": "lib/index.js",
   "dependencies": {
-    "babylon": "7.0.0-beta.11",
+    "babylon": "7.0.0-beta.12",
     "babel-traverse": "7.0.0-alpha.10",
     "babel-types": "7.0.0-alpha.10",
     "lodash": "^4.2.0"
diff --git a/packages/babel-traverse/package.json b/packages/babel-traverse/package.json
index cb6b4b0e62..dd3670b2da 100644
--- a/packages/babel-traverse/package.json
+++ b/packages/babel-traverse/package.json
@@ -12,7 +12,7 @@
     "babel-helper-function-name": "7.0.0-alpha.7",
     "babel-messages": "7.0.0-alpha.10",
     "babel-types": "7.0.0-alpha.10",
-    "babylon": "7.0.0-beta.11",
+    "babylon": "7.0.0-beta.12",
     "debug": "^2.2.0",
     "globals": "^9.0.0",
     "invariant": "^2.2.0",
diff --git a/packages/babel-types/package.json b/packages/babel-types/package.json
index 7e73481d5c..6e7ebeff51 100644
--- a/packages/babel-types/package.json
+++ b/packages/babel-types/package.json
@@ -14,6 +14,6 @@
   },
   "devDependencies": {
     "babel-generator": "7.0.0-alpha.10",
-    "babylon": "^7.0.0-beta.8"
+    "babylon": "^7.0.0-beta.12"
   }
 }