hi, he is pooing, vomiting, randomly coughing at night, arching his back, gassy. I changed position of his cot too. someone randomly told me to change his mattress? not sure what to think? He had re flux! Gaviscon seemed to be helping and then he was fine! he vomits every now and again not every day like it used to be! I don't mind moving the post! not sure how though? Please help!