My LO is 9 weeks today. He was drinking 3-4oz, but mostly finishing 4oz so we upped to 5oz bottles. We switched formula a week and a half ago to try and help with his gas as he was screaming during feeds. Since then he’s just not eating as much. He drinks maybe 2oz per bottle in the day, but at night he will finish 3oz, and he’s eating every 2.5-3 hours. He is happy to just sleep over that sometimes though but I get him to eat.
I know that this is not enough milk per feed for his age, but I can’t make him drink any more. I’ve just fed him and he only drank 1oz, and it’s been 3hrs since his last feed so I’m worried.
Since the formula change he has also been pooping 3 times a day so I don’t want him to get dehydrated. He did drink a 5oz bottle the other night, but immediately projectile vomited it back up And hasn’t drank as much again.
Has anyone else experienced this? I’m getting worried. He’s all good in himself and is still smiley and having wet nappies ect.
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My LO is also 9 weeks and has been a pain with bottles the last few days. He will only drink if he is at the right precise angle. And drinking 4oz instead of 5, in the night we are lucky if he drinks 3oz . He has also been pooping more.
I go from worried to he is still a smiling and happy and definitely having wet nappies about 20 times a day. So I can't be much help but know you aren't alone.
I don't think the weather is helping my LO has fallen asleep drinking each bottle today

I am having the same issues with my daughter feeding a lot less and it started after her 8week jabs. She is also much more clingy and sleeping less too. Could be a coincidence but wondering if your sons symptoms started at the same time as them and has nothing to do with the formula change?
As long as he is happy in himself and the wet nappies are showing he is having enough just keep an eye on things. X