You in serangoon? Not sure of any near there. Around my place here in Upper Bt Timah, there is 1(Baby & Child clinic) in Rail Mall, she's open most night and Sat. Also my regular pediatrician(Ng CF) at Crown Centre, 2 nights weekdays and Sat as well. I used to see 1(Baby Bear) in Woodlands Ave 9 when I was staying there, he's open all nights and Sat. Hope you find 1 near your place soon.