How do I know which size to choose?

Pouch Shirt Woman:

Basically, you can keep the size from before your pregnancy. Have you gained more than 20 pounds? Then take a size bigger because practice shows that you won’t get those pounds off in the first few months. Do you normally have a size larger than your own because of your chest size? Then take a size larger now, too.

Pouch Shirt Man:

Take the size you normally always wear as well. If in doubt between two sizes, take the larger size. It may take some getting used to that the shirt is a little tighter than you are used to. Note, please do not take a size larger, you really have to get used to it. The shirt sits well if it is comfortably tight and does not cut under your armpit. You will find that when your child is in the pouch shirt it actually wears incredibly nicely.