90 mL. According to the CDC, babies who are only getting infant formula and no breast milk need about 2.5 ounces (75 mL) of formula per pound of body weight each day.

A newborn who weighs 3 kg (6 lb 10 oz) would need about 15 ounces (450 mL) of formula per day, divided into 8 to 12 feedings.

This means that at each feeding, the newborn would consume about 90 mL of formula.

Choice A is wrong because 30 mL is too little for a newborn who weighs 3 kg.

This would only provide about 10 ounces (300 mL) of formula per day, which is not enough for adequate growth and development.

Choice B is wrong because 60 mL is also too little for a newborn who weighs 3 kg.

This would only provide about 20 ounces (600 mL) of formula per day, which is still below the recommended amount.

Choice D is wrong because 120 mL is too much for a newborn who weighs 3 kg. This would provide about 40 ounces (1200 mL) of formula per day, which is more than the maximum amount of 32 ounces that most babies need before they start solids.

Overfeeding can cause problems such as spitting up, gas, and obesity.