It seems to vary a lot in my experience. I have two kids who basically got the same treatment. One was eloquently talking in coherent sentences of 4 or 5 words by 18 months ("plane in the sky", "teddy come downstairs", "want something to eat" etc) and was understandable by others outside the family, the other kid was barely able to grunt single words at the same age ("mukk" instead of milk, "nur-sa" instead of nursery etc) that only we really understood as it was just incomprehensible sounds to everyone else
Singing made fuck all difference in that case (FWIW, the grunter is now totally fine as an older kid). Both were walking at 10 months so it was not like one was just "slow" at their milestones
Singing made fuck all difference in that case (FWIW, the grunter is now totally fine as an older kid). Both were walking at 10 months so it was not like one was just "slow" at their milestones
As they say, every baby is different.