Since you have more babies than older ones you will probably have less issues because the new flock is larger than the older flock. You want to have them separate at first, but able to see and talk to each other. Somehow separate with chicken wire is best, so they can go up and check each other out.
I usually get my three week old peeps outside in an enclosure, close to the older birds, but safe in their own pen on nice warm days. They go back to the nursery at night and back out during the day as long as the weather is good. Once they are 5 to 6 weeks then they can be in the chicken fence, but still separate with a fence and at 8 weeks I have them out on their own during the day and into the big girls coop at night. That has worked the best for me.
The first time I mixed a flock I let the new birds get full grown and the older birds wouldn't have anything to do with them, and chased them out every night. I had to wait until after dark and put the new birds into the coop, but at first light the old girls started tearing into the new ones. And their numbers were almost even, 7 old to 6 new. When I started mixing them in A-more slowly and B-at a younger age I had more success and less bloody battles.
However, if you have any new roosters in your new batch you will have to watch the old roosters. As soon as the new ones start to crow they may start into each other, and once the new roosters are full grown they may take on the old roosters. March 1 was my battle day. I have 6 roosters. 2 were raised together and they are 1,2 in the pecking order. The other 4 are all brothers from the same hatch and are just 8 months younger. One of the younger doesn't like his placement in the order and took on #1, then all the others after. I should have sold tickets, they did battle for 48 hours and I had to send my dog out to break up one fight while I took a broom to break up another. After 2 days they shifted the order a bit, but the 1,2 stayed the same. I'll never do this many roosters at one time again. Three max.
I usually get my three week old peeps outside in an enclosure, close to the older birds, but safe in their own pen on nice warm days. They go back to the nursery at night and back out during the day as long as the weather is good. Once they are 5 to 6 weeks then they can be in the chicken fence, but still separate with a fence and at 8 weeks I have them out on their own during the day and into the big girls coop at night. That has worked the best for me.
The first time I mixed a flock I let the new birds get full grown and the older birds wouldn't have anything to do with them, and chased them out every night. I had to wait until after dark and put the new birds into the coop, but at first light the old girls started tearing into the new ones. And their numbers were almost even, 7 old to 6 new. When I started mixing them in A-more slowly and B-at a younger age I had more success and less bloody battles.
However, if you have any new roosters in your new batch you will have to watch the old roosters. As soon as the new ones start to crow they may start into each other, and once the new roosters are full grown they may take on the old roosters. March 1 was my battle day. I have 6 roosters. 2 were raised together and they are 1,2 in the pecking order. The other 4 are all brothers from the same hatch and are just 8 months younger. One of the younger doesn't like his placement in the order and took on #1, then all the others after. I should have sold tickets, they did battle for 48 hours and I had to send my dog out to break up one fight while I took a broom to break up another. After 2 days they shifted the order a bit, but the 1,2 stayed the same. I'll never do this many roosters at one time again. Three max.