I'm just curious as to the reason you decided to have your 2nd child (in scenarios where the 2nd baby was planned).
I spent some time with my sister yesterday and her 2 children and bloody hell, listening to them argue and bicker constantly was just mind numbing - I could have screamed. She's there shouting at them, they're getting upset, she's telling me what a nightmare it is when they don't get on etc etc. I'm sure my sister isn't the only parent to be in this situation. I was at breaking point just listening to them, at least I had the freedom to get in my car and drive home 
From my experiences of talking to parents with more than one child they always seem to have more worries - be it the cost of bringing up two children compared to one, sibling rivalry, sharing their time between them fairly, family favourites, siblings that hurt/hate each other etc. I feel exhausted just listening to some parents when they tell me the stresses of having more than one child.
All that goes through my head is, "So why have another?"
Is it that you wanted a sibling for your current child?
Or that you missed having a baby around the house?
Or that you just love having mini versions of you and your DH/DP 
And is having two (or more) as stressful as I'm led to believe??? 