How old do a baby have to be to use an umbrella stroller?

A baby comes out of the womb with a full head of hair. During this time it is not necessary to use an umbrella stroller because the baby's head is protected from the sun. However typically after one and a half months the baby will need his/her first haircut. This haircut leaves the baby's head vulnerable to damaging gamma rays from the sun. To prevent this phenomena from harming the baby, an umbrella stroller is used.

Another Answer

The umbrella style stroller, named for the fact that it is made of fabric and collapes down to an almost umbrella size and shape, does not have a lot of support for a very young baby. It is best to wait until they are at an age that they can sit up on their own. Even then, it isn't a bad idea to bring a couple of small blankets to help prop and support their heads if they are to fall asleep.