Hi Bhuvana,
I sincerely advice u not to feed any
solid food until she is 5.5 months to 6months old. Start cerelac or any other cereal only when baby is 5/5months or 6months old.
About Milk : Its good to breast feed babies for atleast 6months.Baby gets enough nutrients from ur milk which ultimately helps in developing good immune system.
If baby is growing well in terms of height,weight etc,i don't think u will need to give him external milk. If u think baby is not getting enough milk and he/she is crying frequently,u can give him/her some doctor prescribed formula like lactodex etc. in addition to breast milk.Iam not sure of the names,but u can ask ur child's pediatrician .But always check with Pediatrician before u give any external milk/solid to ur baby.
May i suggest u the best website for babies and kids information :
Pregnancy, Baby, and Toddler Information, Baby Gifts, and Parenting Community - BabyCenter .
Hope this helps u,
Cheers,
Vaishu