Question

multiple-choice question
what has the baby begun doing more frequently?
urinating
sucking their thumb
blinking their eyes
moving their arms and legs

Explanation:

At 21 weeks of gestation, fetal development milestones show that thumb sucking becomes a more frequent, observable behavior. Urination starts earlier, arm/leg movement is present before this stage, and eye blinking typically develops later in the pregnancy.

Answer:

B. Sucking their thumb