Dr. Brown's Natural Flow Narrow Baby Bottle Silicone Nipple, Level 4, 2-Pack

My 9-month-old drains a 6 oz bottle in minutes with this Level 4 nipple. It's perfect for his age and doesn't cause any gas. Great quality.

The flow is indeed fast, which is great for older babies, but my 6-month-old choked a few times. Will use it when he's a bit older.

My baby was getting impatient with the slower flow. Upgrading to Level 4 made mealtime much easier. He still drinks without gulping too much.

These nipples work fine, but I noticed that they can leak if the bottle is placed on its side. I usually use them with the vent system, so not ideal.

After months of daily use and sterilization, these nipples still hold their shape. The flow is consistent. Would recommend.

We use these for a thicker formula and it flows perfectly. My baby can eat without struggling. Great product.

My baby didn't like the feel of this nipple. He preferred the softer, lower level ones. But that's just a preference.

The flow is fast, so for younger babies, watch out. My 7-month-old handles it well now. The 2-pack is handy.

I add a bit of rice cereal to my baby's formula and this nipple delivers it without clogging. Best nipples for that!

It's definitely faster than Level 3, but not a huge difference. Still, my baby drinks efficiently now.