Baby Mobs Only is a Behavior Pack addon for Minecraft Bedrock (1.21+) that changes how mobs spawn: any mob that supports a baby variant will only ever spawn as a baby and will never grow into an adult.

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How it works

Natural spawn only: When a mob spawns in the world (spawn eggs, natural spawning, breeding offspring), it always appears in its baby form.
No growth: Baby mobs do not have the usual “grow up” behavior. Feeding them (e.g. wheat to a baby cow) does not make them adults; they stay baby forever.
No commands needed: The pack overrides vanilla entity behavior, so you don’t need command blocks or cheats. Just enable the behavior pack on your world.

Which mobs are affected

All 28 vanilla Bedrock mobs that have a baby form are included:

Passive: Cow, Pig, Sheep, Chicken, Rabbit, Goat, Polar Bear, Fox, Strider, Hoglin, Panda, Wolf, Cat, Turtle, Donkey, Horse, Mule, Llama, Axolotl, Camel, Dolphin, Mooshroom

Hostile / neutral: Zombie, Husk, Drowned, Zoglin

Other: Villager, Zombie Villager

Baby

Gameplay impact

Smaller hitboxes — baby mobs are harder to hit and can fit in tighter spaces.
Faster hostile mobs — e.g. baby zombies move faster, making combat trickier.
Fewer / different drops — many baby mobs don’t drop loot (or drop less), so survival is a bit harder.
Visual variety — the world is full of baby animals and baby zombies only; no adult versions of these mobs.

Ideal for challenge worlds, roleplay, or anyone who wants a “baby mobs only” experience.

Update

Added support for Squid and Glow Squid