there is one shop there call H&M, i heard they sell alot of kids stuff, my colleague also mentioned she bought quite a bit of stuffs there for her kids. so maybe you can check it out. but not sure where it is located though, you gotta go google it.
anyway, i just came back frm HK recently and the season now is winter, almost all the clothings sold there is winter wear like thick jackets n long sleeves clothings, so not really suitable for SG season. not sure by feb will they be changing their season already.