Sayang, 1kg at 29 weeks is on the lighter side, biasanya baby should be around 1.2-1.3kg by that time, so better check with your doctor to make sure everything's okay, bukan apa, just to be safe. As for the head position, baby still has time to turn, so jangan worry sangat lagi; a few of my mum friends had babies in breech position at 29 weeks and they turned by 32-33 weeks, but your doctor will monitor this during your next scan.