Is a baby cot necessary?

Personally yes a baby cot is necessary. A bassinet is only good for a few months as when baby can learn to sit up, the bassinet will be unsafe. If you intend to co-sleep, then perhaps a cot isn’t necessary for you. A cot is helpful when baby learns to roll around as it would be safer compared to having them sleep on the bed where they can potentially fall off the bed. Unless you are able to let baby sleep on a floor mattress. I suggest to get those playpen type of cot with the mesh sides. I have the wooden cot and my baby knocks her head on the wooden panels and likes to pull on the cot bumpers