Answer: Withdrawal design
Explanation: withdrawal design is an experimental design that helps to determine the effect of treatment, conditions or other interventions on a body, when removed and replaced from the body.
Because the baby cries when the bottle is removed, and stop crying when the bottle is replaced back. That means the bottle has an effect on the baby's mode, and can be used to determine the mode of the baby. This is an example of withdrawal design, because the bottle has acted as the treatment which has an effect on baby, being the case study.