my son turned 5-month old. I had started with hand made juice: one pomegranate in the monring and one apple in the evening. you can add him half spoon sugar in it. don't ever breasfeed him atleast for 30-45 minutes immediately after u give him juice. he's taking breastfeeding at every 1-5-2 hrs interval. i've not started any semisolids or any other tonic other than these two. my son's growth is very normal and he did not catch serious cold so far.