I had two (one after the other - 12 month gap and planned that way ) best thing I ever did ! One of each sex : they've grown up so close and laugh together still daily. Best of friends. Go through the same stages together, play together. Could t be closer. Our lives are so much easier for that.
Don't get me wrong: when they were both under 3 it was very very heavy going and I'd be lying if I said my mental health wasn't unscathed at that time through sheer exhaustion and overwhelm! But my god it's worth it once you pull through the other side ! I'd advise anyone to put your hard hat on , say a few prayers for your sanity for the next 3 years and get them babies out nice and close together 😄!
Friends who gaps of over 2 years (especially with opposite sex siblings ) have tales of regret. One person said to me "it's like having two only children"