Is stroller necessary?

I am wondering if we need to buy stroller. First time to deliver in singapore. Foreigner but after 6months baby will go back to our country, but we planned the baby to come over every 2-3months, with MIL to accompany, since me and husband working in SG. Now i wonder if do we need to buy stroller? I think ill also want the baby to go out sometimes but maybe not everytime. Or go down the block for sun exposure in the morning walk etc. I am wondering if need to buy stroller for baby.