Tall Child

My boy is 13 months but is very tall. We now just have a stroller but he barely fits in it now!! His head is at the top and feet down on the bar what am i meant to do when hes really grown out of it because it wont be long!! He is walking but not at that stage yet where as he can walk everywhere obviously hes onloy 13 months!

This might be a really daft question but can you get strollers in different sizes? Im just wandering if mine is on the small side? Though never really thought its any smaller then average. Im desperate!!

Thanks x