I own a Labrador male of 7 months.
1.when sld v change the meal from thrice a day to twice a day?
2.can v give him bath once a week in summers.
3. At the moment v give him pedigree for pups. when can v start pedigree for adults to him?

You can move onto 2 meals a day when it is almost one year old. Since Delhi summers r extreme, wipe the dogs eye's frequently with a wet soft towel...u can probably give him a bath once in 2 weeks...but don't soap or shampoo then. And normal healthy well balanced food is better any day than pedigree or any other breed of dog food...