Emirates does not offer "Baby" Meals per se - I would suggest either saying your child is above 2 years old and paying the extra in fare for the meal or pack your own food for the child as the puree will be given to you but there is no baby meal, only child meals.
You must have a stop over somewhere because as far as I know the longest EK route is IAH-DXB and thats not 23 hours.
For those that say request a child meal for yourself, its unlikely you are able to do this with booking staff and as for "requesting another" if the flights full in Y class say then it'll mean someone of the crew giving up their hot meal because you are trying to do one over the system.