Breastfeeding 1 Breastfeeding intervention 1 Duration 1 Exclusivity 1 Malaysia 1 Primiparous 1 adult 1 analysis of covariance 1 article 1 breast feeding education controlled study 1 education program 1 experimental design 1 female 1 follow up 1 human 1 human experiment 1 mother 1 occupation 1 primigravida 1 purposive sample 1 questionnaire 1