We ended up having to sleep train our oldest daughter when she was about 11 months old. It only took a few days for her to sleep through the night after we let her cry it out for a few days. Our youngest daughter is 7 months old and we have tried sleep training (very lightly) but I keep hoping she will just one day start sleeping through the night.
Did your LO eventually just start STTN on their own, or did you need to sleep train? If you did sleep train your LO how old were they, and do you wish you would have tried it sooner?