The word krta-sirah-snanam appears here (in SB 3.23.31). According to the smrti-sastra's directions for daily duties, ladies are allowed to bathe daily up to the neck

Expressions researched:
"The word kṛta-śiraḥ-snānam appears here. According to the smṛti-śāstra's directions for daily duties, ladies are allowed to bathe daily up to the neck. The hair on the head does not necessarily have to be washed daily because the mass of wet hair may cause a cold"

Srimad-Bhagavatam

SB Canto 3

The word kṛta-śiraḥ-snānam appears here. According to the smṛti-śāstra's directions for daily duties, ladies are allowed to bathe daily up to the neck. The hair on the head does not necessarily have to be washed daily because the mass of wet hair may cause a cold. For ladies, therefore, taking a bath up to the neck is ordinarily prescribed, and they take a full bath only on certain occasions.

SB 3.23.31, Translation and Purport

Her entire body, including her head, was completely bathed, and she was decorated all over with ornaments. She wore a special necklace with a locket. There were bangles on her wrists and tinkling anklets of gold about her ankles.

The word kṛta-śiraḥ-snānam appears here. According to the smṛti-śāstra's directions for daily duties, ladies are allowed to bathe daily up to the neck. The hair on the head does not necessarily have to be washed daily because the mass of wet hair may cause a cold. For ladies, therefore, taking a bath up to the neck is ordinarily prescribed, and they take a full bath only on certain occasions. On this occasion Devahūti took a full bath and washed her hair very nicely. When a lady takes an ordinary bath it is called mala-snāna, and when she takes a full bath, including the head, it is called śiraḥ-snāna. At this time she needs sufficient oil to smear on her head. That is the direction of the commentators of smṛti-śāstra.