Babies can only fit in a certain amount of sleep in 24 hours and if they are sleeping for longer periods at night they will sleep less during the day. This is the best way for it to be, because you are less tired during the day compared to night and you can make the most of this time being the peak time for them to be learning about their world. Check out the many babies & sleep articles on the main site: https://www.bellybelly.com.au/baby