DS is 2.5. I did sleep training with him when he was 7 months, and since then - bar the odd night - he's been an amazing sleeper.
Since last Monday though, he's been wailing and crying inconsolably when I put him to bed and leave the room. I can't handle the crying so I often go back in after about 8 - 10 minutes. Sometimes he grins when I go in. He might ask for water. I give it to him, kiss him and leave again. Whereupon the agonised wailing starts again.
I am at my wits end. I no longer get any evenings to relax/do chores etc. And he is going to sleep much later than is good for him (e.g. near 9pm).
What should I do? Should I just leave him to cry (like I did when I was sleep training him when he was a baby)?
I should mention that I put him in his proper bed for the first time last thursday, but I'm not sure its related to that as the incessant crying started last Monday, when he was still in his cot.
Any tips gratefully received!