Ugh I totally feel your pain with the nursery stress. When my sister and I were doing the same thing last year for her shower, I almost downloaded one of those cart-sharing extensions but then I got really nervous about my credit card info being exposed. You really gotta be careful with those third-party apps because they can be super sketchy with your data security... tbh I wouldnt trust them with my account access. Honestly, the safest way I found was just logging into the same account on his phone. It sounds old school but it keeps your info secure and you dont have to worry about some random developer seeing your address. Just make sure to double check the total before he hits buy because sometimes Amazon sneaks in extra shipping costs. Might want to consider just sharing the login for five minutes rather than risking those weird plugins.

Ngl i think the security worries are a bit overkill lol. I used this cart sharing tool for my whole registry and never had a single issue. It works so well for keeping track of costs and thats exactly what you need for the nursery stuff right now. Way better than wasting time on a list tbh... literally just one click.

TL;DR: use Share-A-Cart. agree about security risks. i just found this thread but i would suggest auditing the extension manifest permissions first... dont let it scrape your session tokens.