Hi all, I'm looking for a bit of advice about my 5 and half month old. She is an absolute delight during the day, really lovely, engaging and seems to be developing well. Her naps in the day seem to be ok as well, going down drowsy, self-settling and naps for about 45 minutes (which seems to be her sleep cycle). But over the past 5 weeks her night sleep has slowly deteriorated 
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My DH and I now realise how lucky we were, but she used to sleep pretty much through the night from 2 months to 4 months, occasional waking up for a feed. But she has slowly regressed to waking twice, then waking three times, then waking every 2 hours, now to waking up every 45 minutes. Added to this, she now seems to hate going down in her Chicco crib.
We have our bedtime routine: massage, change into PJs, read a book, then lullaby in our arms until drowsy, then down into the crib and she's asleep (though for the last 2 nights, she's woken after 10 minutes...) But then like clockwork she's awake after 45 minutes. She seems to wake initially by grunting then hands up to her eyes as if she's trying to settle herself, but then comes the inevitable cry. As soon as we pick her up, she is settled and asleep on our shoulder. And then from this point it's a massive difficulty to get her to sleep in her crib again. We'll put her back down and it's pot luck if she stirs immediately, after 2 minutes or after 5 minutes. Rarely she does go down, but then it's only for another sleep cycle of 45 minutes and then it's start again.