Stroller

I have 3 kids ages 4, 2 & 8 months. I’m also 17 weeks pregnant with my 4th.

When this baby get here in October, my kids will be 4 almost 5, 2 (3 January 31st) & 13 months.

Do I need a triple stroller or will I be good with just a double one?

The triple stroller would be for my 2 year old, 13 month old & newborn not my oldest child.