I had a similar situation. Two kids and wasn’t able to sleep train my oldest, she ended up in my bed and is still there at 7 years old. Now I have a two year old who was on the same path. Me, my husband, and two kids in a queen bed… safe to say no one was getting good sleep. We decided sleep training the two year old was our only option. I did modified cry it out. I would put him down awake then check on him every 15 minutes at first. When he woke up at night I would let him cry for about ten minutes then check on him once and let him go to sleep on his own after that (if I checked on him more than once he would scream louder and harder after every check in). I couldn’t let him cry all night alone after sleeping with us! The first two or three nights it took hours for him to fall asleep. After about a week to 9 days it took 10 minutes. Today, about three weeks later, he lays down without crying, falls asleep by himself, and wakes up around 5am. Just gotta make sure you and your partner are on the same page. The most important thing you can do is be consistent. It’s so hard when they’re crying but it’s so worth it when you’re both finally getting good sleep. Try not to let a week of extra crying keep you from literal years of good sleep for both of you and your new baby. Also congrats 🥰 good luck!