It is generally safe to take an over-the-counter sleep aid like Sleepaid occasionally to help with sleeping while breastfeeding a 13-month-old baby. It is important to start with a low dose and monitor for any sedative effects or irritability in the baby. If any negative effects are observed, it is best to discontinue use. Additionally, it is recommended to establish a good sleep routine and follow some tips like avoiding technology before bedtime, maintaining a regular sleep schedule, keeping the bedroom dark and quiet, getting fresh air and sunlight during the day, avoiding naps and caffeine, trying relaxation techniques, and addressing any underlying causes of insomnia or stress.