Merotocin in Mothers With Inadequate Milk Production and Infants Delivered Prematurely

Inclusion Criteria: * Delivered at the hospital system associated with the trial center * Delivered preterm singleton gestational age 24 weeks + 0 days to 34 weeks + 2 days * Willing to express milk at least 5 times every 24 hours during the observation period and 6 to 8 times every 24 hours during the treatment and post-treatment follow up * Produced \< 200 mL milk in 24 hours prior to randomization * Delivered 96 to 192 (+4) hours prior to randomization Exclusion Criteria: * Pre-pregnancy body mass index (BMI) \> 50 kg/m\^2 * Mastitis * History of breast trauma, breast surgery, nipple piercing * Prolactin-releasing pituitary tumor, history of Sheehan's syndrome, pituitary surgery/radiation therapy * Pre-pregnancy insulin-dependent diabetes mellitus, polycystic ovarian syndrome. Note: gestational diabetes is allowed (also when requiring the use of insulin for treatment) * Unstable thyroid disease * Moderate or severe renal or hepatic impairment * Mental illness * Significant nasal congestion or mucous production * Use of anti-psychotic drugs within past 12 months