If you're buying a gift for someone from a registry, you don't need to create an account on Babylist. Accounts are reserved for Registrants only. Once you've found the Babylist Shop item you want to buy from a registry, tap Add to Cart—no account, password or login required.
If you decide to get your gift from one of the alternate store options, click on Buy to be redirected to that site to complete your purchase. (Keep in mind, that some retailers may require an account to buy your gift. Each store has different requirements for purchase.)