I stopped going a few years ago due to not being able to reconcile the whole breed showing and exaggeration of type in pedigree dogs thing. I didn't want to give my money to the KC, as it felt like I was supporting this 'scene'.
To be honest though, there is so much more to the show than the breed showing. There's agility, flyball, heelwork to music, lots of rescue organisations and support dogs, lots of educational stuff for dog owners, loads of shopping, some with great discounts - others with inflated prices
and you can pick up quite a few freebie goodie bags of lots of the stalls.
I do miss going, it was the highlight of my year being in a place with so many dogs and dog-people all under one roof, but it just didn't feel right anymore.
It's ridiculously busy. We took ds1 in his pushchair when he was about the same age as your dc and found it really hard to get round, as every walkway is rammed with dogs and people. We didn't take any of our dcs after that.
There's a shuttle bus from the carpark, but that's a bit of a pain with a pushchair, although it can be a good walk to the show, depending on which carpark you manage to get into. We learned to park a couple of train stations away, get the train to International and either walk or take the shuttlebus from there. Also the queues to get out of the carparks at the end of the day have to be seen to be believed.
The food is extortionate, not very good quality and the proper cafes/restaurants are always heaving, with massive queues and no tables available. We always took packed lunches, snacks and water with us and just bought a couple of coffees while we were there.
You will walk miles. It's spread over several halls and it's guaranteed that if you want to watch a display of some sort you will be two halls away and have to fight your way back through the hordes to get there.