diff --git a/packages/react-native/Libraries/Blob/RCTBlobCollector.mm b/packages/react-native/Libraries/Blob/RCTBlobCollector.mm
index 9b2ca8cb3a0..0043c5ae44c 100644
--- a/packages/react-native/Libraries/Blob/RCTBlobCollector.mm
+++ b/packages/react-native/Libraries/Blob/RCTBlobCollector.mm
@@ -45,7 +45,10 @@ void RCTBlobCollector::install(RCTBlobManager *blobManager)
                 [blobManager](jsi::Runtime &rt, const jsi::Value &thisVal, const jsi::Value *args, size_t count) {
                   auto blobId = args[0].asString(rt).utf8(rt);
                   auto blobCollector = std::make_shared<RCTBlobCollector>(blobManager, blobId);
-                  return jsi::Object::createFromHostObject(rt, blobCollector);
+                  auto blobCollectorJsObject = jsi::Object::createFromHostObject(rt, blobCollector);
+                  blobCollectorJsObject.setExternalMemoryPressure(
+                      rt, [blobManager lengthOfBlobWithId:[NSString stringWithUTF8String:blobId.c_str()]]);
+                  return blobCollectorJsObject;
                 }));
       }
               queue:RCTJSThread];
diff --git a/packages/react-native/Libraries/Blob/RCTBlobManager.h b/packages/react-native/Libraries/Blob/RCTBlobManager.h
index bceb8eb5d81..38a7238380b 100755
--- a/packages/react-native/Libraries/Blob/RCTBlobManager.h
+++ b/packages/react-native/Libraries/Blob/RCTBlobManager.h
@@ -18,6 +18,8 @@ RCT_EXTERN void RCTEnableBlobManagerProcessingQueue(BOOL enabled);
 
 - (void)store:(NSData *)data withId:(NSString *)blobId;
 
+- (NSUInteger)lengthOfBlobWithId:(NSString *)blobId;
+
 - (NSData *)resolve:(NSDictionary<NSString *, id> *)blob;
 
 - (NSData *)resolve:(NSString *)blobId offset:(NSInteger)offset size:(NSInteger)size;
diff --git a/packages/react-native/Libraries/Blob/RCTBlobManager.mm b/packages/react-native/Libraries/Blob/RCTBlobManager.mm
index 286710d6910..9d4cde7c457 100755
--- a/packages/react-native/Libraries/Blob/RCTBlobManager.mm
+++ b/packages/react-native/Libraries/Blob/RCTBlobManager.mm
@@ -98,6 +98,12 @@ RCT_EXPORT_MODULE(BlobModule)
   _blobs[blobId] = data;
 }
 
+- (NSUInteger)lengthOfBlobWithId:(NSString *)blobId
+{
+  std::lock_guard<std::mutex> lock(_blobsMutex);
+  return _blobs[blobId].length;
+}
+
 - (NSData *)resolve:(NSDictionary<NSString *, id> *)blob
 {
   NSString *blobId = [RCTConvert NSString:blob[@"blobId"]];
diff --git a/packages/react-native/ReactAndroid/api/ReactAndroid.api b/packages/react-native/ReactAndroid/api/ReactAndroid.api
index 1043824e561..a3a849e0704 100644
--- a/packages/react-native/ReactAndroid/api/ReactAndroid.api
+++ b/packages/react-native/ReactAndroid/api/ReactAndroid.api
@@ -3015,6 +3015,7 @@ public class com/facebook/react/modules/blob/BlobModule : com/facebook/fbreact/s
 	public fun addNetworkingHandler ()V
 	public fun addWebSocketHandler (D)V
 	public fun createFromParts (Lcom/facebook/react/bridge/ReadableArray;Ljava/lang/String;)V
+	public fun getLengthOfBlob (Ljava/lang/String;)J
 	public fun getTypedExportedConstants ()Ljava/util/Map;
 	public fun initialize ()V
 	public fun release (Ljava/lang/String;)V
diff --git a/packages/react-native/ReactAndroid/src/main/java/com/facebook/react/modules/blob/BlobModule.java b/packages/react-native/ReactAndroid/src/main/java/com/facebook/react/modules/blob/BlobModule.java
index d86962793ed..01b37af9268 100644
--- a/packages/react-native/ReactAndroid/src/main/java/com/facebook/react/modules/blob/BlobModule.java
+++ b/packages/react-native/ReactAndroid/src/main/java/com/facebook/react/modules/blob/BlobModule.java
@@ -174,6 +174,14 @@ public class BlobModule extends NativeBlobModuleSpec {
     }
   }
 
+  @DoNotStrip
+  public long getLengthOfBlob(String blobId) {
+    synchronized (mBlobs) {
+      byte[] data = mBlobs.get(blobId);
+      return data != null ? data.length : 0;
+    }
+  }
+
   @DoNotStrip
   public void remove(String blobId) {
     synchronized (mBlobs) {
diff --git a/packages/react-native/ReactAndroid/src/main/jni/react/reactnativeblob/BlobCollector.cpp b/packages/react-native/ReactAndroid/src/main/jni/react/reactnativeblob/BlobCollector.cpp
index d16ba17aa4c..9b8f80cb9eb 100644
--- a/packages/react-native/ReactAndroid/src/main/jni/react/reactnativeblob/BlobCollector.cpp
+++ b/packages/react-native/ReactAndroid/src/main/jni/react/reactnativeblob/BlobCollector.cpp
@@ -32,6 +32,14 @@ BlobCollector::~BlobCollector() {
   });
 }
 
+size_t BlobCollector::getBlobLength() {
+  static auto getLengthMethod =
+      jni::findClassStatic(kBlobModuleJavaDescriptor)
+          ->getMethod<jlong(jstring)>("getLengthOfBlob");
+  auto length = getLengthMethod(blobModule_, jni::make_jstring(blobId_).get());
+  return static_cast<size_t>(length);
+}
+
 void BlobCollector::nativeInstall(
     jni::alias_ref<jclass>,
     jni::alias_ref<jobject> blobModule,
@@ -53,7 +61,11 @@ void BlobCollector::nativeInstall(
             auto blobId = args[0].asString(rt).utf8(rt);
             auto blobCollector =
                 std::make_shared<BlobCollector>(blobModuleRef, blobId);
-            return jsi::Object::createFromHostObject(rt, blobCollector);
+            auto blobCollectorJsObject =
+                jsi::Object::createFromHostObject(rt, blobCollector);
+            blobCollectorJsObject.setExternalMemoryPressure(
+                rt, blobCollector->getBlobLength());
+            return blobCollectorJsObject;
           }));
 }
 
diff --git a/packages/react-native/ReactAndroid/src/main/jni/react/reactnativeblob/BlobCollector.h b/packages/react-native/ReactAndroid/src/main/jni/react/reactnativeblob/BlobCollector.h
index f72e9be5ffb..17046b494f2 100644
--- a/packages/react-native/ReactAndroid/src/main/jni/react/reactnativeblob/BlobCollector.h
+++ b/packages/react-native/ReactAndroid/src/main/jni/react/reactnativeblob/BlobCollector.h
@@ -18,6 +18,8 @@ class BlobCollector : public jni::HybridClass<BlobCollector>,
   BlobCollector(jni::global_ref<jobject> blobModule, const std::string& blobId);
   ~BlobCollector();
 
+  size_t getBlobLength();
+
   static constexpr auto kJavaDescriptor =
       "Lcom/facebook/react/modules/blob/BlobCollector;";
 
diff --git a/packages/rn-tester/js/examples/XHR/XHRExampleFetch.js b/packages/rn-tester/js/examples/XHR/XHRExampleFetch.js
index 5d386d5ba58..3f49af76b48 100644
--- a/packages/rn-tester/js/examples/XHR/XHRExampleFetch.js
+++ b/packages/rn-tester/js/examples/XHR/XHRExampleFetch.js
@@ -11,7 +11,14 @@
 'use strict';
 
 const React = require('react');
-const {Platform, StyleSheet, Text, TextInput, View} = require('react-native');
+const {
+  Button,
+  Platform,
+  StyleSheet,
+  Text,
+  TextInput,
+  View,
+} = require('react-native');
 
 class XHRExampleFetch extends React.Component<any, any> {
   responseURL: ?string;
@@ -59,6 +66,25 @@ class XHRExampleFetch extends React.Component<any, any> {
     return responseHeaders;
   }
 
+  startRepeatedlyFetch() {
+    const doRequest = () => {
+      const url =
+        'https://microsoftedge.github.io/Demos/json-dummy-data/5MB-min.json';
+      fetch(url, {
+        method: 'GET',
+        headers: {
+          Accept: 'application/json',
+          'Content-Type': 'application/json',
+        },
+      })
+        .then(() => {
+          console.log('fetch one time');
+        })
+        .catch(error => console.error(error));
+    };
+    setInterval(doRequest, 500);
+  }
+
   render(): React.Node {
     const responseURL = this.responseURL ? (
       <View style={{marginTop: 10}}>
@@ -88,6 +114,10 @@ class XHRExampleFetch extends React.Component<any, any> {
 
     return (
       <View>
+        <Button
+          title="RepeatedlyFetch"
+          onPress={() => this.startRepeatedlyFetch()}
+        />
         <Text style={styles.label}>Edit URL to submit:</Text>
         <TextInput
           returnKeyType="go"