**Skip to the edit for the best solution if you don´t care about technical details, or previous solutions, the edit has the best solution** Cows (And many other mobs) have an NBT-tag called Age, when the cow is born this tag has a value of -24000 and the cow grows up when it reaches 0 and it stays at 0. When cows breed their age is set to 6000 and it counts down until it reaches 0 again. Cows can not breed unless their age is 0. There is no way to check if the `Age`-tag is lower than 0, you can only check for specific values. This means that you can´t teleport all baby cows and no grown up cows, unless you use 24000 commands, one for every possible age of a baby. You can however use this command to teleport any cow that was born that tick: /tp @e[nbt={Age:-24000},type=cow] <destination> You can use this command to teleport all baby cows and all cows that can´t breed yet: /tp @e[nbt=!{Age:0},type=cow] <destination> Alternatively you can tag all your grown up cows with `/tag @e[nbt={Age:0},type=cow] add grownUp`, before you breed them and then you teleport all cows that don´t have that tag: /tp @e[type=cow,tag=!grownUp] <destination> This command would work, but it is too long for a command block, so there is no way to execute it in the game: /execute as @e[type=cow] unless data entity @s {Age:0} unless data entity @s {Age:1} unless data entity @s {Age:2} <continue this for a while> unless data entity @s {Age:5999} unless data entity @s {Age:6000} run tp <destination> The command length in command blocks is capped at [32767][1], this command would have a length of about 180000. **Edit:** Set up a scoreboard objective: /scoreboard objectives add cowAge dummy Then you run this command in a repeating command block. It will set the score of every cow to whatever value the `Age`-tag currently has. (*It would be enough to run this command once right before you want to teleport the babies, maybe in an impulse command block that triggers a chain command block with the `/tp` command from further down*) /execute as @e[type=cow] store result score @s cowAge run data get entity @s Age 1 After using that command you can teleport all baby cows with this command, it teleports every cow with a `cowAge`-score of -1, or lower: /tp @e[type=cow,scores={cowAge=..-1}] <destination> [1]: https://gaming.stackexchange.com/a/191712/232393