Girls good day?

Girls good day ? Question is about "Biesik" lullaby who from KZs will understand, since recently we started sleeping during the day in Biesik, the little one sleeps so sweetly and calmly, she likes it. Previously daytime sleep lasted for 20-30 minutes, now when we put her in Biesik she sleeps peacefully and doesn't wake up on every creak. Today we went to the pediatrician, she said not to put the head there, it will be flat, and doctors don't recommend this cradle. I sit thinking... but how was it for you?