Guppy fry concerns

[Brookechook]

I have three day old fry and newborn fry and i am going on holiday in 3 days for 5 days so i was wondering if a holiday feeder would release enough and snall enough pieces of food for my fry which will be 6 days old and 3 days old ?? Also i will put one in my breeder tank for any newborns whilst im gone . Will it be small enough for newborns ??