How interested are you in role playing a child in an adult's body?
There have been a number of movies- I'll use Freaky Friday as an example - where adults and children "swap bodies" so this kind of story isn't beyond the realm of imagination.
RAW, the creature is raised in an adult body ...
... but it's most likely to come back as a different humanoid kind than it died as. An elf child may come back as a dwarf adult, a gnome child may come back as a human adult, etc. Looking at the table1, this fifth level spell by definition creates a non trivial change in the PC, unless the PC gets very lucky on the die roll.
Dream fulfillment with a twist
Take the body swap idea of "Freaky Friday" into a world where half orcs, half elves, gnomes, kobolds and much else exist as humanoids. But remove half of the swap. Any child, after hearing various stories and legends, may dream of being a great Elven warrior, or of being a clever Gnome illusionist, or a Kobold who lives by his wits in a world where everyone else is bigger, etc. Why your table is killing off children as part of play is between the DM and the players - various plagues, hordes of undead, an evil cult that kidnaps children and adults and tries to turn them into undead minions (we had that last one at one of our tables, it was suitably dark in tone, but there was no high level cleric nor druid to do anything about their demise) etc. If you take the death of the child as a chance to 'fix' the problem of a dead child with magic, you may run into two age old problems.
- Each problem you 'solve' raises a subsequent problem and
- In some cultures, saving someone's life may incur on you a
responsibility for them.
Discuss this at the table with the DM and the other players: is this the kind of game challenge that interests you?
Better Dwarf than Dead
So what would you rather be? That's a game kids play with each other all the time. "Would you rather be an octopus, or a porcupine?" etcetera.
Here's that question-game adapted to your situation: "Would you rather be a {dwarf} or dead?" (Sub in gnome, half orc, dragonborn, etc for "dwarf" as needed). Most children would rather not be dead
Here's your challenge: role play a child in an adult world
If the PC's player is up for this, using a child's lack of full perspective, or world view, could make for some unusual interactions as the party faces various decisions. Granted, the 'child' will grow up in a hurry once exposed to the dangers of adventuring, but for the right player, this "child like view of the world in an adult body" could make for some great role play.
Or, get a cleric, rather than a druid, to cast a spell for you.
Raise dead and reincarnation are both level 5 spells. Get thee to a cleric, pay to raise the child up from the dead, and let them grow up as they'd been doing before the Grim Reaper came calling.
Either way could add some interesting role play to your table.
1 On a d100; 01-04 Dragonborn; 05-13 Dwarf, hill; 14-21; Dwarf, mountain; 22-25 Elf, dark; 26-34 Elf, high; 35-42 Elf, wood; 43-46 Gnome, forest; 47-52
Gnome, rock; 53-56 Half-elf; 57-60 Half-orc; 61-68 Halfling, lightfoot; 69-76 Halfling, stout; 77-96 Human; 97-100 Tiefling