What could cause a baby to take less than usual feeding?

Hello doctor,

My son is 14 weeks old. His weight is 15.4 pounds, and his length is 2.1 feet. He has been given formula since birth. I noticed that in the last month, he began to take significantly less milk than before, and I cannot understand why. Between one and two months of age, he used to drink around four cups per day. However, between 2 and 3 months of age, he went from four cups to around 3.5 cups.

He seems agitated when he drinks, and flails his legs and arms; sometimes, he will not suck well and just bite. Then, he will drink around 3 to 4 fluid ounces and reject the bottle, but he will continue to suck on his hands and moan. He will grimace at the bottle and even vomit if I insist on giving him the bottle.

His bowel movements are regular to around once or twice a day, and yellow and soft. Sometimes, he has a bit of reflux after eating (some milk coming out), but less than before. How to fix this problem? Am I doing anything wrong? Should I change the formula?

He has gained 2.2 pounds in the last month, but I am concerned that he seems to drink less milk as the daily quantity keeps going down. He drinks around six times per day, around half a cup each time.

Please advise.

Thank you.

Hi doctor,

Thank you for your reply.

I am writing with the same problem that seems to have gotten worse. In the last 12 hours, my baby only had only 3.5 fluid ounces. The last time he had 0.5 fluid ounces, then stopped and sucked his hands for an hour and is now sleeping.

He did not cry at any point. He keeps sucking his hands but will not take the bottle or just take it for 1 to 2 minutes and then stop. He seems alert and happy, almost agitated. He gets really agitated when he eats. Is this still nothing to worry about?

Please advise.

Thank you.