N.P.
you should be ok at that age. They did a medical study that found that the things they need in their intestines to digest the milk and process it are not there prior to 11 mos 3 weeks in ANY child. They tested over a thousand kids and 99.9% of them had that thing show up between 11 mos 3 weeks and 12 mos 1 week old. The other 2 kids showed up LATER.
If you are going out you may want to invest in a good thermos. I went to target and found one that said it kept things cold for 12 hours. Prep it per directions prior to use. Then pour into the cup as you need it. We did this for hiking trips in the woods, in the summer, so it will work wonders.