Yes you can give bath n fruits .. avoid ice cold items...

Yes you can wash his hair and rinse it off quickly. Don't give oil massage prior to bath as of will generally take a longer time to bathe the child and also if baby cries a lot they there is risk of swallowing tap water which will exacerbate the cold. Also dry his hair immediately with a towel or dryer. Yes you can give him fruits mango, mousambi, banana anything. Just take care that it's not very chill or directly from the fridge. Juice is also fine but use boiled and cooled water to make them.