DS was 18 months. He was a terrible sleeper, had never slept through the night once in his whole life so we thought we'd try a big bed because the sleeping couldn't be any worse. I was pregnant with DD and my tummy was getting bigger and it was getting harder to rock him back to sleep and put him back in his cot without bumping my tummy on the edge of the cot.
And he miraculously slept through the night that first night in his big bed...it wasn't the instant end of the night waking but oh my goodness he slept more soundly and woke up less and less.
DD was 15 months...also because I am pregnant but she suddenly started waking up more when previously she had been an amazing sleeper so we thought we'd see if we had the same success with her brother...and yes, she is sleeping better again in the big bed.
However she is more of a wriggler than her brother ever was and has fallen out a couple of times despite having bedrails, she wriggles all the way down to the end of the bed, past the length of the rails. We have learned now to check on her before we go to bed to make sure she is at the correct end of the bed - usually she is about halfway down the mattress by our bedtime so we put her back onto her pillow and she never makes it back to the end of the bed before morning comes.
DD1 was 15 months, DD2 was 18 months (or 16 months, can't remember now).
Reason I knew both times was because they would wake themselves up at night as they were too big for the cot.
2 years 3mths why?? cause at our holiday place he slept in a port-a-cot and he was getting to big so we tried a single he did so well we decided to pull cot down at home and set up a single the next week never looked back, he had never tried climbing out
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