बिमा आरो खुदिया रायज्लायनायफोरा , जेब्ला गथ'फोरा 6 , 15 , 24 , आरो 36 दान बैसोनि फ्रायै साफ्रामबोनो फ्रायै 1 , 300 गथ'या गासै से घन्तानि थाखाय 10 - 15 मिनिट मेलाव भिदियतेब खालायजादोंमोन , जायनि थाखाय लितगिरिहा फुरा फोरमायथि दंमोन ।
Mother and child interactions were videotaped in 10 15 minutes sessions when the children were 6 15 24 and 36 months of age for almost a total of one hour for each of the nearly 1 300 children for whom the authors had complete information .