Personally I think its okay if you have to. I never used to but I have developed quite severe anxiety because my daughter wakes frequently for the boob all night. I broke down in the doctors office.. just.so.tired.. I had.all these feelings of guilt every time she made a squeak and I couldn't get there in one second.. she was held in a carrier for the first four months of her life.. never put Down.. she co slept and fed all night long. some babies are quite good and can be cuddled and fed to sleep or will co sleep and let you get some sleep and as they get older will gradually sleep longer stretches.. Other babies need some training. There is.no perfect way to parent and as I have learnt, your well being is important too.
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