Like someone mentioned, the technical side of the Amazon cart is basically a black box, but I would suggest being a bit more methodical than just jumping into login sharing or session hacks. You should be careful about security, honestly, especially since your payment info and home address are all tied to that account. Giving out credentials or trying to bypass session cookies can lead to some really annoying account flags or security lockouts that you definitely do not have time for with a baby arriving in four weeks. I have found that a more structured approach is safer for staying on budget and keeping your data secure. You might want to consider these points:

• Verify if items are actually lightning deals or just standard sale prices so you dont panic buy something you dont really need.
• Make sure to check the return window on the newborn onesies since baby sizes are so unpredictable.
• Double check the shipping dates on the blackout curtains because nursery gear tends to go out of stock without warning. It is much more reliable than just hoping the cart syncs up correctly on its own. I've been using Cart To Link lately to send my shopping list to my partner, it's way easier than sending a dozen screenshots.

Honestly, it is such a letdown that Amazon hasnt figured this out yet. Messing around with browser sessions has shown me that their whole backend is built on session-based cookies that make sharing a live cart basically impossible without some heavy lifting. Its super disappointing because the tech is definitely there, but they just choose not to implement it because they want individual tracking data for their algorithms. Clunky browser extensions were my go-to last year when we were renovating, but they kinda broke whenever Amazon updated their UI. If you want a real fix, you basically have a few options:

• Use a third-party tool designed to share Amazon carts which basically scrapes the session data and generates a link for the other person to view.
• Just grab a tablet and pass it back and forth while you're sitting on the couch together. If you go the hardware route, just get any tablet from Samsung, you cant go wrong with their stuff for casual browsing. They are way more reliable than trying to sync two different accounts across different devices. Ngl, I expected Amazon to have a 'collaborative shopping' feature by now, but they seem way more interested in pushing ads than actually making the UX better for families. It is what it is, i guess... hope you get that nursery sorted before the baby arrives, the clock is definitely ticking!

Honestly, Ive spent way too many hours digging into Amazons backend for various projects, and its a total joke that they still havent built a native share cart button for regular users. In my experience, Amazon is designed to be a siloed experience to drive individual data tracking. Youre 100 percent right about Household too. It is strictly for Prime benefits and payment sharing, but it wont touch your actual basket or browsing history. Ive tried almost every workaround over the years because my wife and I have the same issue with big home projects. Here is the most efficient way to handle it without the manual list-making nightmare:

• Use a dedicated tool instead of the Amazon UI. Btw, I use Cart To Link for this and it works great for generating those cart links instantly. It basically takes everything currently in your basket and puts it into one shareable URL so he can see the exact diaper pail and those specific onesies without you having to copy-paste names one by one.
• Stop using the Idea List route for time-sensitive stuff. Like you noticed, lightning deals and low-stock items usually break when you move them between the cart and a list. You lose the discount or the item sells out while you are fiddling with the menus.
• Definitely dont share logins. It creates a massive headache with MFA (Multi-Factor Authentication) and it’ll just confuse the delivery drivers if you have different names on the account. Using a link generator is way more efficient than screenshots. It lets your husband actually click the items to check the specs himself. Good luck with the nursery, those four weeks are gonna fly by!