The present research studied the symptomatologic overlap of AD/HD behaviours and retention of four primitive reflexes (Moro, Tonic Labyrinthine Reflex [TLR], Asymmetrical Tonic Neck Reflex [ATNR], Symmetrical Tonic Neck Reflex [STNR]) in 109 boys aged 7-10 years. Of these, 54 were diagnosed with AD/HD, 34 manifested subsyndromal coordination, learning, emotional and/or behavioural symptoms of AD/HD, and 21 had no (or near to no) symptoms of AD/HD. Measures of AD/HD symptomatology and of the boys’ academic performance were also obtained using the Conners’ rating scale and the WRAT-3, respectively. Results indicated that, in general, boys diagnosed with AD/HD had significantly higher levels of reflex retention than non-diagnosed boys. Results also indicated both direct and indirect relationships between retention of the Moro, ATNR, STNR and TLR reflexes with AD/HD symptomatology and mathematics achievement. The pattern of relationships between these variables was also consistent with the notion of the Moro acting as a gateway for the inhibition of the other three reflexes.