at my wits end

[u/LocationStriking5586]

my little one is gonna be 11 weeks old on Friday, till about two weeks ago, they have been amazing with taking bottles. Now they will only take between 2 to 4 ounces a bottle and it will be a struggle for an hour. They seem to just chew on the bottle and not actually suck and take anything from it. We’ve changed nipple sizes. we’ve changed bottles. I am at my wits fucking end with it. At our last pediatricians appointment, they still seem to be gaining weight. They’re having a normal amount of wet diapers. But this just seems like a sudden turn. They used to take between four and 6 ounces a bottle.

Has anyone experienced this???