i agree with the girls - it is all a personal choice.
I cannot vote on anything i havent experienced but i can share my own....
My 2 are 15 months apart.
We planned it this way, so minimise the amount of time off work etc and so they would grow up with simliar stages of life.
Early on it was great. with a newborn and a 15 month old, DD didnt get jealous or hardly noticed i had a baby. she was too excited about the joys or life and exploration.
Things slightly changed when DS was 6 months and started to crawl, DD realised she no longer controlled what the baby played with, but as DS grew she had a fun play mate.
They are now 4 (next week) and 2.5 ish and they are best of friends (and the worst of friends at times too - but i actually put this down to boy vs girl as the arguments are usually due to the fact DD wants to do hair and nails and DS wants to do pirates at her lol)
They cuddle each other on the couch watching movies, are at the same stage with bikes and scooters. TT 12 months apart so get to move out of baby stage at home for me.
Both in big beds and DS qwants to be like his sis. DD will pat DS to sleep and they enjoy the same outdoor games.
i was actually watching a lady today with a newborn and 4yo, ANd the 4yo wsa having a tanty and she was BF and couldnt move etc. ANd i thought i am glad that by the time the tantrums with #1 started #2 was old enough to walk and i could deal with her without a crying baby iykwim.
But like i said i havent experienced a big gap, but i can understand the joys or helpful 4/5yos though! they want to help with everything and wow that would be great for sure!! (imagine them grabbing napppies for your cause your hands are full etc! lol)
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