There are different nipple flow rates available with this model that will follow baby's growth. (thankyourbaby.com)
With the different nipple flow rates to choose from, parents can find what works best for their baby — and change nipple sizes as the baby grows as well. (rookiemoms.com)
If your baby is getting bored or angry during feedings, that's when to change nipple flow on bottles. (mymilkybaby.com)