At this age, most babies need between 2 and 3 naps per day, a morning nap, an afternoon nap, and a one hour (maximum) late afternoon nap to help them bridge the gap between naptime and bedtime (and avoid bedtime resistance due to an overtired baby). (blog.cloudb.com)
There are studies in Western cultures that find high rates of pediatric sleep disorders — upwards of 40 % [1]-- commonly defined by night wakings in infancy and then night wakings and bedtime resistance in childhood. (evolutionaryparenting.com)