5weeks n 4 day old sleep troubles also very gassy

Hello everyone. At first we got our almost 6 week old son on an ok schedule. His usual naps and he would go to sleep around 12-1am and sleep until 6. We went and spent the day at my moms n now his sleeping is all thrown off.. He has been going to sleep around 4-5 am in the morning after a few day naps. 😫😢.  Any suggestions on getting him back on his schedule.. Also he is very gassy. Can any moms with this issue give a few suggestions on what they do. I would greatly appreciate it.. THANKS 🙂