She never had enough sleep in the daytime (or indeed at night either, really) as a baby. I worked far too hard on "not getting into bad habits" in the first 6 months that she didn't really learn to sleep at all. So I had to have a million additional "rods for my back" when lack of sleep for both of us reached crisis point after 6 months old, just as a means to cope.
The most significant was rocking to sleep. Also reliant in milk at night time, never resettling without a feed (and lots of rocking), even when an older baby/toddler. She still ued to scream for several hours before going to sleep even when in my arms being rocked.
There's loads more. Having that middle class scrunched-nosed distaste towards dummies meant I left it too late to introduce one and she never gained much benefit from it. No comforter toy/blankie to give comfort was established either. So she had nothing to give her any chance of any comfort or security when she did wake up in the night. So of course it meant she always screamed shouted for me when she woke, because I was her comfort and security.
By the time DC1 was 12 months old I was 7 months pregnant with DC2, maternity leave hand ended 4 months previously so I was back to teaching full time. She was waking 2 or 3 times between 11pm-7am and taking anything from 30 minutes to 2 hours to go back to sleep. We did CIO. I am not proud, hate that we had made all these mistakes to get to this point but acknowledged the fact that something had to be done immediately. I vowed that I would never make those mistakes again so that I never needed to be so uncaring towards my child again. I kept my vow.
Ashleyc123
If your baby goes to sleep independently normally, can normally go to sleep alone and access his own comfort and was previously doing this reliably - then there has to be something causing the change.
Like riding a bike, a baby doesn't 'unlearn' how to access comfort and security themselves to go to sleep.
Various things can cause a child to need extra reassurance though - illness, upset, insecurities, pain, uncomfortable, change in routine.
With so many illnesses recently, it could be whatever was cauing him being ill. It could even be a reaction to 3 weeks of antibiotics - these can cause urine infections, yeast infections or tummy upsets.
Periods of time when extra reassurance is needed are usual right through until aged 5 or 6, so this is all just part of parenting really.