Anybody knows, where can I get matching clothes for Mum, dad and baby girl in Singapore ?

Actually, depend on what kind of family Yee you prefer. If you like those with same pattern/clothes, you can try Lee fashion, camouflage or the shop at HarbourFront level 2. If you are like me and like somethings personal, you can try labeloflovestudio or toddley thought on Facebook. This is what I designed and printed on my own.