Rania, my baby was very small by day 3, (2.4kg) and my boobs were enormous and he was very hungry because my milk was late coming in after my c/s. HOWEVER I EXPRESSED milk, about 20ml, and then he was much easier to latch on. This is also what the lactation consultant said to do. You are 100000% better off expressing out 20ml instead of giving DS 20ml of formula. The formula in a bottle is not helping DS learn to latch and its not helping your supply xo

Also, he may just need a good burp if he is 'fussing' about, try burping and then putting him back on the same side. When they are young (and even now) a feed for me 90% of the time resulted in a sleepy "milk drunk" baby after 40min