Breastfed babies do not get overfed! They will continue to take in milk until they've had enough or they may continue to suckle for comfort. When suckling for comfort they don't take in milk so a pacifier is also not necessary. It may create an extra problem if you have nipple confusion. Babies will know when to stop.
My baby used to be like that. She would keep drinking and drinking until she spat out (vomitted a couple of times). We got so scared of constantly feeding her but feeding her was the only way to pacify her. It could be a growth spurt that occurs around week 3.
Do ease her bloated tummy by applying ruyi oil in a upside down v motion and bicycle leg exercise. Then turn her over on your thighs, one thigh supporting her chest the other on her hip, pat her back and massage downwards. You should hear some farts coming. The spit up could also be due to this wind in her stomach.
Burp regularly between feeds (when you switch breasts) or more often if required. They usually outgrow the spit ups. Mine cleared around 2 months.
Read more