Almost 1 and still spitting up daily?

Mystic_Gemini • single mother by choice to an amazing little boy - 12/22/17

My LO will be one on 12/22. He used to spit up a lot but I haven’t seen more than an occasional dribble for months. But yesterday when I was picking him up at the babysitter he spit up a decent amount. When I expressed surprise she said he does that at least once a day. Is that concerning at this age? And any idea why I never see it? She has him M-F 7-5, but I’d think I’d see it on weekends if it’s really every day.