If she is relaxed and comfortable, it is a good sign. If a baby is not healthy, a mother will usually display frantic and erratic behavior. When babies are new to the world, they have to get used to their bodies not only swimming, but also breathing. They have to get comfortable with where their blowhole is. As a result, babies do something called chin slap breathing, which involves taking its head farther out of the water than necessary to breath.
Echolocation is an ability that babies have to learn how to use.
For this reason babies end up with a few cuts and scrapes within the first weeks of life. Merina had a lot of steering to do within her daughter Pandora's first very active days of life. Pandora was quite spirited and would often try and race in front of her mother. We often saw Merina physically pick Pandora up with her rostrum and place her in another part of the pool. They nurse, on average, for two years but have been observed to nurse up to four and a half years.