Early sitting, possible spinal injuries and poor falling asleep

Good day! Tell me, can I myself check that the baby is all right? What is bothering you? It is disturbing that we started planting the child early (at 3 months approximately. I really wanted to, didn’t want to lie, roared much, demanded to be planted). 22.12. He is 6 months old. He began to crawl on 11/18/16., He began to sit down on 11/12/16. She often gets up on her legs and falls on her ass - I also worry that there will be spinal injuries that are not noticeable, but will “crawl out” in adulthood. Another question about sleep. He sleeps three times during the day, falls asleep for the last time at 5:00 pm and may sleep for 3 hours. Do I need to wake up? Always put a problem for the night ((At 23:00 I feed and put it outside in a wheelchair in any weather - only it saves. I don’t fall asleep in the crib, even if I’ve already slept on my hands), I put it on, half-awake and crawls, starts to cry.