Mixing older chicks with "newborns"

[shelleyb1969]

Can I mix 9 wk old bantam orpington chicks with 4 week old bantam cochin chicks?

 

[Jennyhaschicks]

My birds are 3 weeks apart. When I first mixed them the only one that really bothered my babies was my cockerel. The pullets pushed the babies around, but it wasn't too bad. It has taken them weeks to become one flock, but for the most part they are blending well. They are now 14 weeks and 11 weeks old. I put them together when the youngest were about 4 weeks old and they weren't together 24/7. I would take them outside and then put the younger ones back in their brooder.