wht can i give my baby

No, at that age you should keep a close eye on him. A cough can quickly turn to bronchiolitis then to pneumonia, because they are so small it's hard for the lungs to work the gunk out.
You can give him tons of affection, that's his favorite medicine right now!
Give his doctors office a call and just chat with a nurse for what to give him.

You can give him Calpol 2months + which has paracetamol in which will help reduce his temperature as well as a pain killer which will help with sore throats and muscle aches.

Karvol is a decongestant which is deisgned for babies you can get it in a vapour rub or capsules which you empty close to the baby so he breathes it in.

There are some cough mixtures that you can use for babies.

Always check with the pharmacist or doctor before giving your baby any medicines though. Hope this helps.