need some advise

my baby just turned 2 months. 1) she is on formula milk and poop only 2-3 times per week. is this normal? the texture is still okay and colour is okay too. just the frequency of the bowel movements. 2) when she drinking milk, it sounds like blocked nose but she doesn't have runny nose. she doesn't seem like having difficulty to breathe but i can't help it to feel pity for her. do i need to see a doctor for this? 3) my baby spit up everytime after milk but the amount is like 1-2 tablepoons. sometimes she will let her phlegm out after milk. is this normal? when do i need to change her formula? like what symptoms do i need to look out for? what kind of formula should i change to and the brand? she currently on S26. pls advice🥲 #FTM