It is possible that your baby is going through a growth spurt. Growth spurts could take place within the first year at two, three and/or six weeks, at three months and/or at six months. It usually last for 2-3 days but could also go up to a week. During which your baby will feed more and would need less sleep (hence waking up more frequently at night or taking shorter naps). Given her small stomach, it is common that she would want more frequent feeding to meet her developmental needs.
First of all, your confinement nanny is ridiculous. A naughty 3 week old does not exist! Ignore your confinement nanny. As per pp, it sounds like a normal growth spurt. Are you feeding her until she naturally comes off the breast? If she falls asleep, do you try to wake her by tickling under her chin or her feet? This could help to give her a more substantial feed and send her into a deep sleep, so that hopefully moving her to the cot won't wake her.
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