why dont you wait for a few more mths? i only wait until dear son is 4mth old then i change his FM. in fact my mum advised me to only change after 6mth old.
cos changing FM might cause baby to pass very watery stools or constipation. initially when we changed dear son's FM, he passed very watery stools everyday and pediatrician said he was not used to the FM. after nearly 2weeks, his stool is okay alrdy but he poo every 2 days. only until these few days things are better.