My 2.5month old baby is having severe vomitting and loose stools . She’s on breast milk exclusively. She was given 2 scoops of nan pro 4 days back as I had to go out on an errand . The pack was opened 3 months back . Yesterday only I noticed on the cover of the pack that it is to be used within 3 weeks of opening . Could that be causing vomitting ? I read somewhere that opened pack if used after 3 weeks can cause brain inflammation and intestinal infection. I m worried . Please guide