I've had malaria thrice living in Mumbai and still wont receommend taking anti-malarial as a preventive measure.

Why

*The side effects are bad. Your liver is under massive trauma when taking these
*If you child happens to catch malaria, it will go unnoticed and surface only later in a very late stage
*taking the usual precautions (proper clothing, moskito net at night, repellents both on usually effected parts and on in the room) is sufficient