I am going to back to work in less than a week, and my daughter will be 8 weeks old. I am currently breastfeeding exclusively and plan to continue pumping at work. She is staying with my mom and mother in law during the week and I will be sending milk with her. However, I do want to send some formula too FOR EMERGENCIES ONLY. I am a nurse so sometimes, of course, I am delayed at work and not home on time. The doctor suggests either Enfamil Gentlease or Similac Sensitive or Gerber Good Start Gentle. I know nothing about either. Any opinions??