Yes i would think that is pretty normal, im certainly no expert (!!) but would would think that as long as they're eating and drinking and full
Of beans in between times then that's ok .. I too remember worrying when Molly slept for 3 hrs solid in the afternoon and thinking she'd never sleep at night but she did!! Enjoy it
... As the saying goes.. Let sleeping dogs lie 
Of beans in between times then that's ok .. I too remember worrying when Molly slept for 3 hrs solid in the afternoon and thinking she'd never sleep at night but she did!! Enjoy it