Having a hard time getting my 6 week old to sleep. Sometimes she will sleep in her crib for up to 2 hours other times she is up 15 minutes after you lay her down begging to be held. Having this issue with naps and at night. She will not sleep in a swing or rock n play. If I hold her in my arms she'd sleep all day. We've tried swaddling, white noise, and laying her down with a paci. Anybody else having this issue? I feel like she should be sleeping better by this age.