my one month old boy always blowing spit bubbles. is it normal? why does he does so?

A. Spitting and Vommitting are very normal... especially in small babies..as their reflux system is still developing... so it can send back the milk.. sometimes even through nose as mouth and nose are internally connected... it's normal.. So please burp him regularly before, during and after the feed.. also keep him in the upright position for some time even after the burping.. also don't over feed him.. some baby keep on sucking for comfort .. this lead to overfed.. Also keep a watch on what you're eating.. Also the baby vomit during the cold and cough as like we adults they cannot spit out the phulgum, so they Vomit it out... So vomiting during cough and cold is also common... So check for cold and cough too if the Frequency of vomiting is very high then please consult the pediatrician regarding the same .