If you are planning to buy a new Stroller for a four-month-old baby, then make sure the Stroller is recline. Moreover, we don’t recommend to use Stroller for a four-month baby. Look: You have to wait 1-2 more months so that your baby starts sitting correctly. If you have some quality piece of Stroller in which all the accessories are recline then go for it. Even, you can take such a Stroller for picnic purposes also.