If we're talking about cribs, then the cot is also a question. The old…

If we're talking about cribs, then the cot is also a question. The older two practically didn't sleep in the crib while breastfeeding, they started sleeping in the crib but as they were restless at night, they preferred co-sleeping. Now I'm thinking, should I buy a cot? Do your babies sleep in cribs? If yes, maybe with a rocking chair would be better?