“…Previous investigations found that at 1-4 years of age, LP have an increased risk of presenting developmental delay (Nepomnyaschy, Hegyi, Ostfeld, & Reichman, 2012;Voigt, Pietz, Pauen, Kliegel, & Reuner, 2012;Woythaler, McCormick, & Smith, 2011). Some of them analyzed the infant perinatal course and socio-demographic data to be included as possible independent risk factors for developmental outcome, especially in case of studying middle-long term cognitive and language development (Freeman Duncan et al, 2012;Greene, Patra, Nelson, & Silvestri, 2012;Morag et al, 2013). However, findings on LP's developmental outcome are still contradictory (McGowan et al, 2012;Romeo et al, 2012).…”