my baby is 5 month & his weight is 6.2 kg & his height is 65cm....he looks slim he is 5month old still he is having 60-90ml of formula feed ....what can I do to increase his appetite? i m really worried about his weight

A. By age 4 months, most infants have doubled their birth weight, and by 1 year, most have tripled it. Most babies also grow about 10 inches (25 cm) by their first birthday. Keep in mind that babies and children have growth spurts, too – which means that growth isn't always a gradual, predictable process.