SCMP science reporter Holly Chik presents the final in a series on how Hong Kong’s Covid policies have affected its economy and people. Child development expert Dr Fanny Lam, expert and founder of the Hong Kong Developmental Paediatrics and Child Neurology Centre, discusses how masks, home-schooling and staying indoors have affected toddlers, children and teenagers at a neurological level, and how parents can help them rebuild as they return to schools and socialising.