My baby girl does not have a sound sleep at night. she Wakeup at slightest noise frequently and start crying ... it is very difficult to make Her sleep again.what should I do???

First and foremost if the child is gaining weight as per the growth curve then there is no cause for concern. Feed regular healthy home food and ensure that you do not force feed or show anxiety while feeding. If food is perceived as stressful by the child then they develop an aversion to the same.