My 9-month-old son has been attending nursery for a month, and during this time, he has hit his head twice, resulting in significant bruises each time. This has never happened at home. The first incident was explained as him falling and hitting his head on a baby gate when another child was behind him. The second time, they said he crawled after a staff member leaving the room and bumped the side of his head on a table leg. I'm really concerned about these incidents and wondering if this is normal for it to happen so frequently. He is set to start a different nursery in March due to us moving house, but I'm considering whether I should pull him out of this one sooner.