The best way to see if a baby leopard gecko is eating is to watch after the food has been placed inside the tank. Many times the gecko's will eat as soon as the crickets are put inside the tank.
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They are alert and upright. When they see their food they will dive after it and snatch it up quickly. If your bearded dragon is not going after his food and not excited about getting fed then they are sick or cold. Try getting a higher heat lamp.