请教用英语怎么说：“为什么弟弟不会自己走路，要人抱”，因为他太小了“

Why does my little brother refuse to walk by himself and require to be carried in the arm? Because he is too young.

my brother is too young to walk.

Why the younger brother will not walk, the important person will hug”, because was too small for him

Why did my brother do not walk, others to hold "because he is too small

Why is that my younger brother beyond to walk,becuase he is too young