This problem has been going on for a few months now with dd2, who is 19 months. Every time she's put in her cot, either for her daytime nap or at bedtime, she screams the place down for at least 20 minutes (longest has been about 45 minutes). I know there is nothing wrong her, and most of the time she is tired. I usually just leave her until she falls asleep but it breaks my heart to hear her getting into such a state. (If I go to try and calm her down, as soon as I leave the room she starts again and we're back to square one.) If it were just her daytime nap (which she has anytime between 11-1pm) then I'd stop putting her down, but she's the same at nighttime too.
DH thinks its because she thinks she's "missing out on something", but dd1 and 2 go to bed at the same time. We've tried keeping dd2 up later than dd1, and although she loves staying up later, it's still the same when she goes to bed. DH also thinks its because she doesn't like being on her own. I've thought about putting her into a bed but DH is agains this idea. Any suggestions anyone?