Help! 8wk old won't nap

Hi ladies, any advice for a baby that won't nap? She's 8wks old and sleeps about 9 hours 9:30pm - 8am but barely naps at all during the day. She's often close to Asleep while eating but when I put her down she'll wake up right away. If I put her down when she yawns she'll stay awake and happy for 45 minutes cooing (I feel awful for not providing stimulation) will then cry for 5 mins and fall asleep for not more than 20 minutes... I'm just worried it's affecting her brain development. 😔😓😞. Any thoughts or advice very appreciated