Naw, they reduced the spawns at the school not that long ago. I just ran a playthrough of it a few weeks ago and found it a very easy start. One of my favorites, in fact, due to the lax spawns and high quality loot.
I think, from your other comments, that you play on an older version rather than the current experimental – which means yes, probably, the old school was outrageous with the number of child zombie spawns – to the point that I would never choose that as a starting location. I viewed it as similar to the hospital or mall – there’s upside to starting there, but for a baby character it was almost impossible to navigate.