What's going on???

Pa

LO is refusing feeds or going longer in between feeds. He's not night feeding every 2hrs anymore (yay) and putting himself back to sleep rather than comfort feeding. When he does wake up for his feed, he pukes it all out and falls right back to sleep. In the day he's not wanting to nurse like before. He was eating every 3 hours before Christmas and now he's going every 4-5 hours.

He hit 6 months on the 21st but his check up isn't until mid January. Does this sound normal for their age or should I be worried and take him in?