Night sleeps

Hi mamas - FTM query.

My little one is almost 3 weeks old and she sleeps like a champ during the day - 3/4 hour sleep stints. At night we’re lucky for 3 hours once, but mostly get between 1.5-2.5 hour sleeps. She is breastfed. Should I be doing anything different during the day with her day sleeps I.e not letting her sleep for that long or in her afternoon naps ending them a bit earlier? Or is she too young too to worry about that stuff and let her be?