my son unfortunately stop mother breastfeeding, at the age of 5 month, since then he depend on similac milk, he is always crying, not sleeping well, whole night he not sleep, his sleep is very weak, maximum he sleep for 2 hour then wake, he is not sleeping more than than, he wake many time and can't sleep regularly for more than 2 hour... he is normal, not having any issue, I regularly meet his doctor kindly suggest