Four month regression

We’re in the same boat with our little one! Fighting all her naps when she’s clearly tired and up a few times through the night when she was sleeping through.
I’m trying to keep routine, naps through the day no longer than an hour and a half, bed time between half 7/half 8 and looking out for her tired cues through the day and trying to get her to sleep as soon as I notice them.
I keep telling myself it’s just a phase it will be over soon 🙃 it’s hard when they were sleeping through you get used to having some sleep.. we’ve got this 💪🏼

We are the complete opposite and starting to feel a tad more normal now.
Hes 3 and half months old and only just starting to go 7 or 8 hours at night after being up nearly every 2 hour.
But he cries every evening and has done since about 4 weeks from 5.30pm till 7pm then he goes to bed.
It was very stressful and I felt the same very much like why can't I as his mum comfort him.
But I have just had to accept this won't be forever and to not stress about it.
I know its going to happen every night and I don't go out after 5.
We have found that he loves a bath. I know they shouldn't bath everyday but it does calm him before bed and gives him a routine so goes in about 6.40pm then bed by 7.

My little boy still doesn't quite have a routine and we haven't reached yet a long sleeping stretch, the longest is about 5h and then wakes up for a feed about every 1.5-2h. The most challenging part is when he's hungry and won't latch to breast and cry and won't feed unless we dance and sing while at breast... for some reason he likes baby shark ( my eldest started singing it to him and noticed it calmed him down ) and we repeat at almost all day feeds... tried other nursery rhymes without avail.... tried other popular songs and so far only baby shark works 🤣🤣