Background: Although breast milk is adequate to meet the energy and nutrient requirements of an infant up to four to six months of age, thereafter it is insufficient to sustain normal growth and needs to be supplemented with other foods, such as supplementary foods. Inexpensive and available plant protein sources such as legumes can be used in child feeding. Germination of legumes is an applicable and easy method to reduce the antinutritional factors and consequently increase the availability of minerals and digestibility of protein and starch. Objective: The objective of this study was to evaluate the protein quality of formulated supplementary foods by use of bioassay procedures.Methods: Two weaning foods were formulated with 60% roasted wheat flour, 25% germinated and dehulled green gram flour, 10% skim milk powder and 5% carrot powder (WG); and 60% rice, 25% germinated and dehulled lentil, 10% skim milk powder and 5% carrot powder (RL). The formulated supplementary foods were made to 30% slurry and then roller dried. They were tested previously for nutritional qualities. Sixty weanling rats of albino strain, balanced for sex distribution, 21-23 days of age, were divided with randomized block design to ten groups. They were fed 8% protein reference standard diet for two days. One group of animals received the basal diet (0% protein). Three groups of animals received reference diets containing three levels of skim milk powder (SMP) (3, 6 and 9%) and six groups received experimental diets containing three levels of the test materials (3, 6 and 9 % of each weaning food).The protein content of formulated diets was analysed by Kjeldahl method. The animals were fed ad libitum for a 14-day experimental period, obtaining weight changes twice weekly and daily food intake. Data were analyzed statistically and relative protein value (RPV), nitrogen growth index (NGI), relative nitrogen growth index (RNGI), net protein ratio (NPR) and relative net protein ratio (RNPR) were estimated.Results: Relative protein value (RPV) and Relative Nitrogen Growth Index (RNGI) were 0.9, 0.85 and 0.78, 0.95 for wheat and green gram based (WG) and rice and lentil based (RL) supplementary foods respectively. Both supplementary foods had high Net Protein Ratio (NPR) and Relative Net Protein Ratio (RNPR).Conclusion: The results confirm that RL supplementary food had higher protein quality but both the formulations can be used safely as weaning or supplementary food.