Hmm, boleh normal tapi bergantung lah, some mums experience weight loss in the first few weeks especially if breastfeeding, tapi 2-3kg quite a bit. Ada few of my mum friends yang drop weight fast early on sebab hormones and breastfeeding demand yang besar. Best you mention this to your doctor or midwife just to make sure everything okay lah, especially if you're feeling tired or tidak cukup energy, better safe than sorry!