Don't have stroller

When my son was still a baby he don’t have any stroller so whenever I need to bring him with me I always carry him and because he is a little big for his age I am having a hard time carrying him. So there are times that I just leave him at home and just buy something for him when I get home but still I feel bad. So next time that I will have a baby I will never forget to buy strollers so I can always bring the baby along with me.