Isn’t it fairly obvious why juveniles are smaller? They have to fit inside the mother, or inside an egg which had to fit inside the mother. Even if the egg could potentially grow, you’re limited by the energy reserves you started with until you hatch and find more. Staying in the egg also seems very dangerous (can’t hide or run away from predators, can’t move away if temperature/water/etc levels aren’t good, etc).
I can’t tell whether or not your second paragraph is disagreeing with anything I said in my post.
Isn’t it fairly obvious why juveniles are smaller? They have to fit inside the mother, or inside an egg which had to fit inside the mother. Even if the egg could potentially grow, you’re limited by the energy reserves you started with until you hatch and find more. Staying in the egg also seems very dangerous (can’t hide or run away from predators, can’t move away if temperature/water/etc levels aren’t good, etc).
I can’t tell whether or not your second paragraph is disagreeing with anything I said in my post.