My baby girl is 2 months old and has lactose intolerance. We are giving her Zerolac. Since starting, she has stopped vomiting, but she has severe gas, is unable to sleep, and cries a lot. Her birth weight was 3.3 kg, and now at 2 months she weighs 4 kg only. Currently, she is taking around 60 ml per feed(formula) I would like to know: Does Zerolac help in proper weight gain? Should we continue with Zerolac or switch to any other formula? How can we manage her gas and discomfort?