At approximately 16.25 inches and 3.33 pounds, your baby may feel like quite big and heavy. But he still has lots more growing to do in these next 9 weeks! He continues to add fat to his arms and legs and his kicking and punching have probably picked up pace as his brain and nerve connections continue to develop. If all this movement keeps you up at night, take heart, it's a sign that your baby is healthy, strong and active.