Hi , I'm Dr Suresh K Yadav M D (paediatrics) ,I have gone through your question and understand your concerns,
9.5 kg weight for 18 months child is slightly on lower side. Apart from weight growth and activities of child are also important. If baby is active and gaining weight regularly (although a bit on lower side) , it is not much reason for concern. Try to give him frequent and energy dense foods to help gain weight.
Zerolac was started in March . Is he still having diarrhoea? Zerolac is used for
lactose intolerance , most cases of which are transient in nature secondary to temporary
lactase deficiency post prolonged diarrhoea , I do not see any reason to continue it for such a long time unless there is permanent lactase deficiency.
If we are considering cow's
milk allergy or intolerance than also 6 months have passed and a trial of normal milk diet can be given after discussing your doctor.
Hope this answers your question. If you have additional questions or follow up questions then please do not hesitate in writing to us. I will be happy to answer your questions.
Take care.
Thanks.