Wise parents, pls tell me which of these three Low cost diaper brands I should buy. I can't afford the price tags of MamyPoko etc. Anyone use onwards? What about petpet and FairPrice housebrand diapers?

I use petpet for my boy during the day. It suits him well. No leaks or rashes. Actually the brand of diapers you buy depends on what suits your baby. Different brands suit different babies because of size, cutting, etc. Don't just rely on the recommendation of others or just ok their own experiences. You'll have to try to find out if it suits.