DS is 3 months. Currently he's downstairs with us til we go to bed about 9, he's usually fast asleep and I have to wake him to get him changed etc.
I know the advice is not to let them sleep alone until 6 months, which is why he's with us, but the advice also seems to be to get them in the habit of going down awake into their cot from a fairly early age.
I feel like he might go down for a long stretch if put in his cot earlier. I don't want to go to bed earlier than 9.
What age is it ok to put them down? How are you meant to get them used to sleeping in a cot alone if they don't do it until 6 months?