Michelle, I dont think you are being irrational... i do similar things to you, to some degree. Claire is 4 months and sleeps in her own cot in another room (much to my disappointment as hubby really doesnt like her being in our bed, but thats another story) so when I wake up overnight, I will always go into her room and make sure she is breathing. Sometimes I will even poke her to make her move, but not wake up. Or sometimes I will gently place my hand on her chest to feel it going up and down as she breathes. If she is very quiet in the car, I stop and check on her too. I havent lost a baby so I dont know what that is like, but just wanted to send you some hugs and tell you that youre not alone. I still do these things alot, but not as much as I did in the first few weeks after she was born.