How did you sleep train your baby?

Kali
I have a 4 month old, and she's almost never fallen asleep on her own. When she was younger than 2 months, we would have to rock her to sleep, but currently I breastfeed her until she falls asleep. I've tried putting her down when she's drowsy after a feed, but as soon as I do she cries and screams herself wide awake. Any tips would be helpful and appreciated! 

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