Aw! He is so adorable! I think it's a boy because of his cere (the wax-like-stuff just above his beak). If The cere is blue, then the parakeet is a boy. If the cere if brown or beige, then the parakeet is a girl. But some boy parakeets can have brown or beige ceres, so only an expert and really tell. And of course, he is a baby, his cere may change color as he get older. That happened with one of my parakeets. But I'm pretty sure he's a boy.