My son is one month and one week old and he suffered from colic pain . We changed formula milk , also giving simethicone drop.. breast feed is once per day since my wife doesn't have enough milk .He had this pain for past one week and we are giving drops for past 4 days , 3 times per day . Also we are doing burb after each feeding and leg cycling exercise. But still he had this gas problem and we are feeling this gas pass always from his anus . He suffered lot while passing gas and rest of the time he is kept silent and sleeping . But this gas disturbing him every 30 mins so he is not able to sleep properly . How long this colic and gastric problem exists? Please advice .