A Baby can be a new born and I assume most people call them a toddler when they start to crawl/walk and 18 months is the human standard for nursing-----by 18 months medical believes based on the stomach/salvia/teeth that human children are done with milk by 18 months old……
Most women today that try nursing are done by 8 months due to the child biting them……..while some women will nurse their baby girl 5-8 years old…….and one case locally the chubby girl was known to nurse her mom in the yard in front of the school bus as it drove away because the girl would run to her mother who would be waiting for her and she was at least 8 years old…………………..BUT the medical standard has always been 18 months.