Most typically developing infants are able to sit alone without support at around months of age. two three to four four to eight eight to ten

d. eight to ten.

Explanation:

At 4 months, a baby typically can hold his/her head steady without support, and at 6 months, he/she begins to sit with a little help. At 9 months he/she sits well without support, and gets in and out of a sitting position but may require help. At 12 months, he/she gets into the sitting position without help.

answer; estimate the number between the highest and lowest number; ///