Not Eating 😕

So I took my LO across country to visit family and he went from eating ~30oz a day at home to ~20oz a day while on our trip. He appeared to have lost a little weight and his wet diapers averaged 5 a day. We just got back from our trip yesterday and I didn't know if I should wait until he gets settled back and see if he starts eating more (like he had a vacation eating issue--new sights/excitement) and just wait for his next appointment to talk with his pediatrician or should I make an appointment with his pediatrician for this week? Our trip was 2 weeks and I have his 4 month well appointment near the end of this month.