A 40-day-old baby farting very smelly is usually related to indigestion, often accompanied by breath holding, blushing, stirring legs, farting more often, abdominal distension. For infants is a relatively common symptom, often and overeating greasy food or breastfeeding too greasy food related, you can give the baby to take mamma love, bifidobacteria or clostridium casei and other probiotics to regulate, but also can be used to abdominal hot compresses or clockwise abdominal massage, to promote digestion of the child. It is strictly forbidden to do the so-called exhaust exercises, lift the lower limbs for abdominal compression, which may easily cause pediatric liver and spleen rupture or colon rupture.