I want the tyre of that buggy. Please suggest me because the tyre of my buggy is with tube.
I will point you in the direction of any good, larger bicycle shop. They have tubes of different sizes as well as the skill to help you out with a change. Try a few, it doesn't mean that much if one says they don't keep the smaller tubes. I mean, small bikes also have small tubes, and the style is actually the same...
Your next step, if this is for any reason not applicable to your case, would be to contact the seller you bought your pram at, and ask for replacement wheels or tubes - or any kind of service where they can provide you some.