I took my baby 20 months then with couple of mom friends here in the summer. Big mistake! After the long drive we reached and found out that the counter closes for lunch from 1 -2 pm. There was such a long queue to get tickets and then another for entry. The entry queue was uncovered and kids became uncomfortable. Advice is to go really early or have someone stand in the line up for you. The cost is NIL for kids below 3. Cost to carry and take pics from mobile is rs 500 per phone. Digi can is around 1,000.