Baby boy is 9 weeks old and today he has barely been wanting to nurse. Usually he would eat for about 10-13 min but today he’s lucky to stay on more than 5-8 min. He’s arching his back crying refusing the nipple but then if I give him his pacifier he’ll take it and stop crying instantly. I’m just nervous he’s not getting enough milk. I sometimes give him bottles of breastmilk and yesterday we had a Christmas party so I used 2 bottles of breastmilk instead of nursing him. Is that why he’s not nursing today, he’s been peeing/bm are fine. How do I know he’s getting enough... anyone else’s baby only nurse this long