When should I switch to it, and how long should I stay on it?Updated an hour ago

Switch when your baby arrives. If it's easier to have it ready, you can start a few days before your due date. The base formula is the same as the Complete, so it's safe for you and baby either way. 

Doctors often call the first 3 months after birth the fourth trimester, but your body keeps recovering well beyond that. We recommend taking the Postpartum Pack for at least a full year after birth, especially if you're breastfeeding or pumping.