Inspire Clothing Be A Ninja Long Sleeve T Shirt Why be average when you can be inspired Envelope neck for easy dressing Garment washed for superior softness and minimal shrinkage 100% thick cotton for an extremely soft and comfortable fit 0-3 Months (up to 6 pounds) 3-6 Months (7-16 pounds) 6-12 Months (16-22 pounds) 12-18 Months (22-27 pounds) 19-24 Months (27-30 pounds)