We have baby food available on all long haul flights, there are two types smooth or chunky (you can see I know nothing about babies) there are a few choices of each including savoury and dessert. What we don't provide is adult or children meals you need to pay for a seat to get those. You say both children eat the same type of food so they will have to share one meal.
A suggestion is to order a child’s meal in your name and tell the crew you will have whatever is left after all the orders have been taken for yourself. We cater to 120% of the booked load to enable passenger’s choice.
CIHY