I have give hexalac to my 4 months old baby the bottle was open 2 months before and expiry date is in 2022 so it's ok to give?

A. Hello ma’am You must check the box also normally say that consume within a months time once you open the packet so I think you should not use it because it is a matter of your child so just check the box 1st and just read the instructions what I mentioned because as per my as my information goes you have to consume it within a months time