SCN2A and Neurodevelopmental delay: Both gain‐of‐function (GoF) and LoF variants in SCN2A have been associated with a spectrum of NDD + E, including benign familial neonatal‐infantile epilepsy (BFNIE), Ohtahara syndrome, Lennox‐Gastaut syndrome and West syndrome (Brunklaus et al., 2020; Wolff et al., 2017).