I think if you are still happy to co-sleep and it's not disturbing your sleep then it's not a problem. We co-slept with Kynan a lot when he was younger, especially when he'd go through a rough patch with his sleep. Generally we brought him into bed with us if he woke and couldn't go back to sleep in his cot. And yes, when we co-slept he would nuzzle up to the boobies a lot too LOL (he never took to a dummy & does all of his comfort sucking on the boob or uses his thumb). Gradually as he's gotten older he hasn't needed to co-sleep anywhere near as much, hardly ever actually, usually only when he's teething/sick.