6 weeks | 3 months | 6 months | 9 months | 12 months | |
---|---|---|---|---|---|
Results are expressed as estimated mean (SE) at given post-term ages. At all ages, weight, length, and head circumference were significantly greater for boys than for girls (p<0.001). | |||||
Boys | |||||
Weight (kg) | 3.863 (0.128) | 5.156 (0.127) | 7.038 (0.178) | 8.209 (0.259) | 8.670 (0.364) |
Length (cm) | 51.4 (0.6) | 56.7 (0.6) | 64.8 (0.6) | 70.5 (0.7) | 73.9 (0.9) |
Head circumference (cm) | 37.9 (0.3) | 40.2 (0.3) | 43.5 (0.3) | 45.4 (0.4) | 46.0 (0.4) |
Girls | |||||
Weight (kg) | 3.134 (0.134) | 4.276 (0.132) | 5.874 (0.176) | 6.761 (0.246) | 6.938 (0.337) |
Length (cm) | 48.8 (0.6) | 54.1 (0.6) | 62.3 (0.7) | 67.9 (0.7) | 71.3 (0.9) |
Head circumference (cm) | 36.0 (0.4) | 38.3 (0.4) | 41.6 (0.4) | 43.5 (0.4) | 44.1 (0.4) |