However, evidence for the effectiveness of baby boxes is scarce and it is hard to separate out the impact of baby boxes from other factors that have helped to reduce infant mortality.
Fodd bynnag, mae'r dystiolaeth o ran effeithiolrwydd y blychau babi yn brin ac mae'n anodd gwahaniaethau rhwng effaith y blychau babi a'r ffactorau eraill sydd wedi lleihau marwolaethau babanod.