Baby not taking feeding. Feed gap is.

Hi my baby girl is 5 months old. Till last week she used to have one time cerelac and one time ragi porridge, along with formula feed and breast feed. The feed frequency was every 3-4 hours. But since 5 days the baby is not taking any type of feed. Not the formula milk, cerelac nor ragi porridge. Baby cries a lot and lot during the feed and she closes the mouth very tight during the feed, she dont even open the mouth. Forceful milk feed she will vomit. Yesterday I visited my pediatrician and adv the baby weight gain is good, she is healthy and normal. And to change the feed sessions to 5-6 hrs. But even though at 6 hrs of feeding gap, baby is still not taking any type of feeds. Worried soo much . Her poop and urine output is good . She poops 3 times a day. Please anyone help. Baby is not at all ready to take any type of feeds how much ever the feed gap is.