I've seen a lot of 4 month sleep regression posts on here recently.
This time last year I had a breastfed 4 month old who was up every hour all night crying, in the day would refuse sleep and only slept on me when he did eventually go to sleep.
I felt like it would never end
Fast forward one year - it'd midday and the same child (who sleeps through) has just picked up his teddy, walked upstairs to his cot and pointed at it. I put him in and he waved me goodbye.
I shut the door and he is now asleep
It really does get better! I promise!
As much as I hated it at the time, I really miss my baby who used to want snuggles. Please make the most of it while you can 