My baby is 10 weeks old. He sleeps well in his crib at night time but during the day he takes a nap only when held or when we put him in his swing. Is it good to let the baby sleep in the swing for all naps in the day time. I was worried since he is in a curled position in the swing and his back wont be straight. The moment we put him down in the crib or even in our bed during daytime he wakes up immediately and starts crying. Any ideas to make him sleep better?