Pro Tip

Nipple Flows: When to Switch?

Warning: If you breastfeed and bottle feed, continue using a slow-flow nipple to make sure baby doesn't lose interest in the breast. If it's too easy to get milk from a bottle, they'll be less inclined to put in the work at the breast.

For the rest of you: Your infant will send clear signs they're ready for the next level:

• Irritability
• Extended feeding times
• Lack of interest

The third, lack of interest, is very true for my daughter, Lily. At 7 months, she uses a level 3 nipple. If ever a level 2 accidently finds it way on a bottle of hers, she will eat a couple of ounces and be done. As soon as you replace the nipple with a level 3, she goes to town.