Jealous :(

Okay so I’m sure it’s my hormones (I’m currently 26 weeks pregnant) but i have a 15 month old who isn’t a very clingy cuddly baby. He is just always on the go and basically as boy as they come. Except when i have my step daughter. He is always reaching for her to pick him up, he is always reaching for her when I’m holding him and will just sit with her and i have to admit, I’m a little jealous. I love that she loves him so much (she’s 10) and I’m very grateful for it but I’m a little hurt by it. Has anyone dealt with something similar?