IT/Headscratchers

It

 * 1) Seriously, it's existed since before the Big Bang, and it's been on earth for thousands upon thousands of years, why wait until 1985?
 * Might be that It's existence as  made It capable of being pregnant simply because It willed it. Or...
 * Might be that It's existence as  made It capable of being pregnant simply because It willed it. Or...

Why did It completely wipe out the first European settlement over It's lair?
Shouldn't It have left some of them alive so that It would have more people to feed on 25 years later?
 * Maybe it saw in their minds or souls that more people would come eventually, so It saw no reason to stint Itself?
 * Maybe It was just starving. Wasn't that the first meal It had since It arrived on Earth?
 * Maybe It feed on them without considering the possibilities of these puny mortals until later.


 * Why does It need Henry Bowers to kill the Losers If It has so much power?
 * That was pretty explicit. It's power is based on fear and emotion. If they have strong enough will, they can overcome It's power through various mental techniques . Henry, on the other hand, is a purely physical being and can kill regardless of his victims' state of mind.