Hot and sweaty

Is it normal for babies to be hot always? My 2.5 mths old always sweat! Instances such as - when I latch him outside non aircon place, with nursing cover, out side at non aircon place lie in stroller . He will cry and when I carry him his back is sweaty, hair becomes oily and smelly. We bathe him almost daily . Whenever we go out, he will sweat so come back must bathe . Even I carry him in konny, his heat transfer will make my chest sweat and wet, and his shirt will be soaked in sweat. I wanted to purchase other carrier now as the konny is making my shoulders painful. But the materials seems to be too hot for him. When going out, I let him wear sleeveless or cotton tshirt, nice clothes or branded clothes all can’t wear cause he sure sweat