What is Global Developmental Delay? Global Developmental Delay (GDD) describes a child who has delays in two or more areas. Causes of GDD is unknown or could be linked to environmental or genetic factors. Children with a low birth weight or ones who have other medical conditions are likely to show developmental delays. One of the signs of a developmental delay is a lack of achieving developmental milestones. To book an assessment or for more information please email office@manchesterneurophysio.co.uk call 0161 883 0066 . ← Previous What is global developmental delay