DS is almost 2 weeks old and up until last night was sleeping 2-3 hours at a time. We are formula feeding and have noticed him being very gassy and having frequent hiccups. We decided to give the sensitive tummy formula to him last night to see if that would help with the gas and hiccups. Last night DS was extremely fussy and would only sleep for maybe 45 minutes at a time and even then it was not a restful sleep. He would then wake up and cry even though we knew he had been fed and changed less than an hour before. We tried to let him cry for a bit to see if he would cry himself back to sleep but that didn't work. We fed him probably every hour and a half and he took 2 oz. every time. We also were checking/changing diapers at that pace. Finally around 6:00 this morning, after he was fed he fell into a comfortable sleep and has now been asleep for over 2 hours. Has anybody else experienced something similar? I'm wondering if has something to do with the change of formula. It's the same brand just for sensitive tummies. I would think that it being the sensitive formula it would have helped.