you never know if you are feeding formular at the beginning, how will your baby be?
don't give too much pressure to yourself, as PC9 said, 鼻敏感很多是遺傳的, it is not related to breastfeeding, also breastmilk is the best to baby, especially baby has allergy, running nose.
here you can find the support ! he will prove breastmilk is the best when you see the difference between breastfed baby and formular baby, also weight is no longer a concern if you have read the recent article from WHO, keep it up!