how much pounds should a 3 year old weigh
3-Year-Old Boy. On average, a 3-year-old boy weighs about 32 pounds on his third birthday and about 36 pounds at the end of the year, just before his 4th birthday. About 5 percent of boys weigh less than 26.5 pounds on their third birthday and about 5 percent of boys weigh more than 44.5 pounds on their 4th birthday.-Year-Old Girl. The average girl weighs about 31 pounds on her 3rd birthday and grows to 35 pounds by her 4th birthday. However, 5 percent of girls weigh less than 25.5 pounds on their 3rd birthday and 5 percent weigh more than 45 pounds on their 4th birthday. Visage/Stockbyte/Getty Images.