You said that your baby is only 10 wks old. Don't worry... He'll get used to it. He probably just doesn't like the idea of being leashed. He just has to get used to it. Mine did it in the beginning to. Just flopped right down to the ground and wouldn't budge. You just have to train him to use a leash. Start a little every day inside the house and work your way out... He'll get the hang of it...
Mine's a year old now. When I pull the harness out now she get's all excited
But then when i go to put it on her I have to chase her around the apt to put it on...
But once its on we're all good
And on our merry way! It's a little game we play everyday!
We have a step in harness now and I prefer that to the one that I had to squeeze her head through before!