My 2 m old baby was 3 kg at birth now he is 4.8 kg. Normal? He drink 4 bottles of formula whol day n I breast feed 3 times at night normal?

Weight gain. This would be considered normal weight gain for this period of time. .
How old now? In order to adequately answer this question, we need to know the age of the baby now! Here is a CDC growth curve you can use also to plot. Please re ask the question with the current age. http://www.cdc.gov/growthcharts/data/set1clinical/cj41c017.pdf.