How do you handle night wakings

My son is 6.5 months. A couple weeks before Christmas he started sleeping 8 hours straight most nights. He got up to 12 hours a night. For the last month or so he'll wake up multiple times in the beginning of the night. Usually he'll fall asleep for good 10/11 and sleep until 7ish. The last week or so he's been getting up multiple times a night. I think it might be all our fault because we let him nap in our arms. Yesterday he did really well napping in the crib. Only at 30min but he would do that while in my arms.

My wife was frustrated today. He jumped awake when being put down for naps. He woke up after only an hour or so in bed. I was on a zoom call with friends and I think he was crying for a long time. She just walked out on him. I heard and ended my call. She wants to let him cry it out. I don't agree with that. He is still nursing and at bed time that's how he falls asleep. He usually only needs to be rocked if she goes in when he wakes an hour or 2 after I put him down.

How does your little sleep? What is your night time routine? Any advice how to help my little stay asleep?

Thanks.

Picture of Teddy attempting to eat nature for attention.