When baby cries, AFTER using Ferber method

Question

We used the Ferber method when my son was about 5.5 months old and after just a few days he was able to self-soothe and sleep through the night.
He is now 6.5 months old and there have been a couple times here and there where he’s woken up crying in the night. I never know how long I’m supposed to leave him... I don’t want to go in immediately and reverse his ability to self-soothe (is that possible?) but I also don’t want to let him cry if something is actually wrong. 
Can someone explain to me what you’re supposed to do AFTER the Ferber method?

Answer

I promise I’m not judging but my pediatrician told me not to let my babies cry it out no matter what age they are. I let them fuss because sometimes they go back to sleep on their own but usually when they cry they need something. 
At that age your baby could be starting the teething process or something else could be causing it. Sometimes babies sleep well and then go through a milestone or something and their sleep patterns change. It could be anything. But I do know babies will sleep through the night when they are ready so I wouldn’t be too discouraged. Also I noticed (especially this time of year because people start to use heaters) my little ones will wake up if their noses are stuffy because the heater kind of dries them out so I found using saline mist and a bulb syringe before bed can sometimes help clear them out and moisten their noses so that they don’t get dry and stuffy. Just some ideas.

Answer

We started Ferber at 6 months. When she was that young I'd only let her cry for no more than 5 minutes. If she was still crying I'd go in and soothe her and see if anything else was wrong. However, from my experience we kept having to go back and do sleep training. Growth spurts, teething, illness of any kind always led her to not sleep well. At that point we would do what we could to make her feel better and then once she was over whatever was wrong we would go back and sleep train again

When baby cries, AFTER using Ferber method

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