P2            Up to 3 lbs/ 1.36 kg

P1            Up to 5 lbs/ 2.27kg

Pre          Up to 6 lbs/ 2.70kg

NB           Up to 10 lbs/4.50kg

0-3M       11 lbs/ 5.00 kg

3-6M       12 to 15 lbs/5.40 to 6.80 kg

6-9M       16 to 19 lbs/7.25 to 8.60 kg

9-12M     20 to 23 lbs / 9.10 to 10.40 kg

12-18M  24 to 27 lbs./10.90 to 12.25kg

18-24M  28 to 30 lbs /12.70 to 13.60kg