He may be nervous about the new surroundings so you should give him time to get used to you, but I just want to give a word of caution. Even a small rooster can really hurt a child. My sister's friend had a bantam rooster that was a pet, and no other chickens. They'd had him for over a year and all was well. But one day he attacked the 18mo daughter while she was playing in the back yard near him, leaving her with cuts all over her face and arms and scratches in her eyes. Thankfully her vision was unaffected, but it could have turned out very differently. If he doesn't calm down, don't trust him with your kids. There are plenty of nice roosters to keep a mean one around.