4 month old only have 3 bottles a day

If weight gain is good then it's all good! And congrats on having good nights! Enjoy it xx

Might just be going through a phase. My little girl is almost 4 months and she was averaging around 900-1000 per day during a growth spurt and has dropped to 800-900 on average but eats smaller amounts more frequently. She was premature by about 4-5 weeks, but she’s gaining weight well, just still feeding every 2-4 hours.

I’d just speak w gp/health visitor if you’re really concerned and ask for weight check. They may be able to recommend something if needed, but I’d def not force feed if he’s not wanting.

As others have said, if the weight gain is good then bubs is happy with what they’ve got! Please also remember that because your baby was premature, the HV will go off their ‘corrected age’ not actual age. So they’re more like a 3 month old than 4 month.
My baby was 4 weeks premature and we found that her feeding pattern matched a month behind her actual age until very recently (she’s just turned 6 months)
Your baby could also be like mine, a ‘meal’ baby rather than snacky. They get all of the milk they want at meal times and quite routinely rather than smaller, more frequent snack bottles.
Just go off the hunger ques, if they want more they’ll definitely let you know!