DS is one of those babies who needs to learn sleeping skill. I don't think routine really matter for DS. His nap pattern is more like an "evolution". I went with the flow in the end. I remember the 2 weeks sleep training (after coming back from Ngala) over the christmas break was stressful and it didn't work. DS just wasnt mentally ready. Then, bouncer with pat and shoosh. Just a few weeks ago, I noticed that he was ready to go back to his cot and self settle (with dummy and comforter). He has been napping in his cot since. Yes, he protests (crying) sometime and I keep on checking him. A bit like controlled crying except i don't do the timing, which is what controlled crying is about. I go back in to put his dummy back in etc. If he is tired enough, he falls asleep. This is when we finally see the pattern of his schedule. Ya, he is not a textbook case. I don't go in straight away either but most of the time he wakes up crying (unhappy). I suspect he hasn't had enough but sometime he won't fall back to nap.
He knew how to sleep at night since 9w old. Pat and shoosh until 3.5 months. Then, self settle for night sleep since 3.5 months. Again, with dummy. Somehow he learns it earlier than nap. It is just staying asleep without aid is the problem now. I sometime wait for a few seconds to see if he would go back to sleep before going in helping. On the other hand, I kinda wish to let him protest (crying) just a little but it would disturb DH sleeping and the neighbours. For a while, it is all wishful thinking that he would learn the skill when he gets older. It just seems to get worse with the night sleep. Perhaps when he learned how to put the dummy back in correctly.
@Gelati: yes mucus is what bothered me as well. Perhaps your dS stomach is still sensitive, that's why there is mucus in it.