Children’s early language development is under the influence of several positive and negative factors including television as an input source and family’s socio-economic status. Considering that, this study investigated the effects of these variables on children’s vocabulary development using a quasi-experimental design. To this end, 60 Iranian children, 30 from high and 30 from low socio-economic status, were selected using stratified random sampling. They were divided into four groups based on their background TV exposure and socio-economic status. TOLD-3 was given to the groups as a vocabulary development test before and after a 6-week observation. Results indicated that the high socio-economic-low background group scored higher than the other groups in the vocabulary development posttest while the low socio-economic-low background group scored lower that the other groups. Furthermore, while high background TV had a negative influence on the children’s vocabulary development in families with a high socio-economic status, it had a positive influence on the children in families with a low socio-economic status. These results have some implications for families, first and second language studies.

儿童的早期语言发展受到多种积极和消极因素的影响，包括电视作为输入源和家庭的社会经济地位。考虑到这一点，本研究使用准实验设计调查了这些变量对儿童词汇发展的影响。为此，使用分层随机抽样选择了 60 名伊朗儿童，其中 30 名来自高社会经济地位，30 名来自低社会经济地位。根据他们的背景电视曝光率和社会经济地位，他们被分为四组。TOLD-3 在为期 6 周的观察前后作为词汇发展测试给予各组。结果表明，在词汇发展后测中，高社会经济低背景组的得分高于其他组，而低社会经济低背景组的得分低于其他组。此外，虽然高背景电视对社会经济地位高的家庭的孩子的词汇发展有负面影响，但对社会经济地位低的家庭的孩子有积极的影响。这些结果对家庭、第一语言和第二语言研究有一些影响。