Hi, I had gone through your question and understand your concerns.
In short :- exclusive breast feed only till 6 months of age
No , starting cerelac or other weaning food is not recommended at 4 months of age , baby's also cry for reasons other than hunger like
colic , gas and normally also .If baby is passing urine 4- 6 hourly, gaining appropriate weight , active , I do not see reason to worry.
You should take a balanced diet so that there is more milk formation .
In last do not start cerelac, give her breast feed only.
Hope this answers your question. If you have additional questions then please do not hesitate in writing to us.
Wishing your baby good health.
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