What is the cause of shortness of breath in a newborn baby while breastfeeding?

It may be physiologically normal or pathological. If your newborn’s shortness of breath is relieved after stopping breastfeeding, this is normal and may be due to poor suckling and there is no need to be overly stressed. If shortness of breath is still present after stopping breastfeeding, it may be due to a respiratory or congenital disorder and the cause needs to be identified at the earliest opportunity.