 Prolactin is the primary hormone responsible for milk production and its levels are proportional to breastfeeding frequency and the child ’ s milk requirements.
<fluency>  Prolactin is the primary hormone responsible for milk production and its levels are proportional to breastfeeding frequency and the child ’ s milk requirements.
 Prolactin is the primary hormone responsible for milk production and its levels are proportional to breastfeeding frequency and the child ' s milk requirements.