A healthy birth and enlargement weight is good for your baby. The average birth weight for a typical toddler will be boys (3.2-3.6kg or 7-8lb), girls (3-3.5kg or 6 3/4lb -7 3/4lb) and the average height may be boys (48-52cm) and girls (48-51cm).
After trailing some of her birth weight during the first days after birth, your baby will establish to grow gradually. By the focus of her first month, she will perhaps be gaining about 0.5 to 1 ounce per day. After the first month, weight gain may be 1.5 to 2 pounds and length may augment 1 to 1.5 inches per month. These are just averages; as long as your baby is staying on her own growth curve, you should have no concern about her progress.
Your pediatrician will determine her weight, length, and head circumference once a month and plot your baby's own growth path on a chart, so any growth troubles can be spotted early. All babies grow at different rate. There is no need to worry if your baby has periods of slow growth interspersed with spurts but if two successive measurements seem low, check with your pediatrician.
At 3 months, the 'emblematic' baby weighs 13 pounds and measures 24 inches. But don't worry if your baby is smaller or larger. Babies, like adults, vary in size and shape. In fact, the 'average' weight for a 3-month-old can range from 9 to 16pounds and the average length from 22 to 25 inches.