Bubba is almost 6 months and Bonnie is only 3 months. When I let these two play, they go at it playing and jumping on each other. Bubba does gentle bites against her ears and legs, but she comes back biting his cheeks and face to where her teeth get into his skin and makes it bleed. Her bites seem kinda hard but I can still tell they are playing. They will try to knock each other down and chase each other around the house. Is this okay?