The present research assesses the noun inflectional acquisition of children acquiring Urdu and Punjabi as 1st Language. A total of 36 bilingual children age ranged 3.0 – 6.0, divided into six groups, participated in this study. Their acquisition of noun inflectional morphology which includes gender, number and case categories was judged through picture description task. The results of all these three grammatical categories of these bilingual children reveal that the acquisition of Urdu and Punjabi noun inflectional morphology is a gradual process not an instant one which follows overgeneralization of different sorts. This acquisition is better acquired with advance age, more exposure and frequency. The results are in line with the constructivists’ ideas of inflectional acquisition.