Acquiring grammatical morphemes is the main part in languageacquisition. Brown (1973), de Villiers and de Villiers (1973) and Larsen-Freeman(1975) mentioned that there is a natural order of acquisition of grammaticalmorphemes in English. This study investigates the development of acquisition of {-spl.}, {-s ps}, and {-s 3d} by Iraqi EFL learners and to find out if Iraqi EFL learnersfollow the same order of acquisition. It is also to differentiate between male andfemale learners in their acquisition. The study was based on a grammaticalityjudgment test that was administered for 30 participants each academic yearspecifically in May 2013, 2014, 2015 and 2016 respectively. The results of analysispresent the average of the percentage of identification of grammatical morphemesconcerned. The average displays that the acquisition of {-s 3d} more fulfilled, withan average (66.583%), than {-s pl.}, {-s ps} which are (58.083%) and (50.25%)respectively. Also the results show that Iraqi male and female learners have thesame order of acquisition of grammatical morphemes but there is a difference inthe averages obtained which reveals that Iraqi female EFL learners acquire these