why is my 9 m/o waking up 6/7 times during the night?

he was a good a sleeper until about 2 months ago and i have no idea what changed, like he used to sleep a 9 hour stretch and now it’s between 4-8 wakeups in a 12 hour period.
he also is having about 3 8oz bottles in the 12 hour period.
why is this happening?

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21 month sleep regression

Oh my god is a 21 month sleep regression a thing!? Waking every hour crying.
I feel like I could cry 😂 I’m completely exhausted 😩

Advice on headbutting

Hi I was wondering if anyone has any advice on what to do about my son headbutting his crib at night. He’s almost two and every night to soothe himself he hits his head relatively hard and this morning we got him up with this bruise on his head. Any advice on how to stop him hurting himself would be great

I feel like my nipples are too big

Baby was doing ok the first couple days until i realized he wasn’t getting enough to eat. Cue pumping and supplementing with formula. He’s doing really well but everytime i try to get him to latch he gets so frustrated and like can’t even latch anymore. Did I make a mistake starting to bottle feed? Do I still try to get him to latch so he doesn’t forget my nipples 🥹

MIL not listening

Just looking for a bit of advice. I'm really lucky to have a "village" and once a week my MIL watches the baby (10 wk), so I can shop/nip to the gym etc. The only problem is she doesnt feed her. Ill have expressed ready to go or formula as back up but she never feeds her.
My LO tends to cluster feed a little on a morning as shes a decent night sleeper, but only really cries at desperation - she puts her hand in her mouth or grunts as early warnings. Ive told MIL this, and asked her to feed when she sees it. Ive tried saying "she was fed 30 mins ago, she'll want another in half hour", but she never does.
Yesterday I explained shed been really hungry and hadnt expressed much as shed fed so much I hadnt had chance, said to give her a little formula as she'll want it in about 45 mins. I got home 3 hours later and asked how much shed eaten.
"Oh, nothing, she had a little cry but we distracted and she went to sleep. She'll probably be starving when she wakes up".
She was starving. And then had both sides (which she doesnt normally do) and ended up more refluxy and messed up her timings all night, so she woke up more through the night (not ideal as we have an event today).
I dont wanna fall out as I'm grateful for the help but I'm running out of things to try. My husband is on my side and wants to tell her not to come if she just wants her "to sleep" and not actually look after her. Any advice??

Did you implement a nighttime routine straight away and if so did your little one start sleeping through before 8 weeks?

Keep seeing people say it’s just luck. I think it’s a little bit of luck but also a good solid routine.

Obviously lots of exceptions, poorly babies etc.

Tonie boxes, are they worth it?

I am guilty of screen time with my baby and I really want to cut down on this, my little boy has recently turned one and I’ve been thinking about getting him a tonie box. Are they worth it?