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I am assuming you are asking for formula milk for a four-month-old baby.
May I suggest:
The best thing will be to continue breastfeeding until six months of age.
For a full term baby, I suggest Nestle NAN1 range - Nan Optipro HA 1 Gold. For a preterm baby Nestle Pre Nan.
Give breastfeeding as a priority. For overall development, no formula feed can replace it.
Every child is different. So, formula milk cannot be the best. It usually is a trial.
Other is from Abbott - Similac 1.
For more information consult a paediatrician online --> https://www.icliniq.com/ask-a-doctor-online/paediatrician