It's not a myth that babies sleep longer during the daytime goats. It's also perfectly fine to have frequent shorter naps too. It is the total amount of sleep that is important, it's never fun dealing with over tiredness.
I understand that in baby lead, gentle, attachment parenting, shorter naps are commonplace right through past the toddler years, unless holding/carrying/feeding child when sleeping.
If the short naps, or naps only when being held are a problem then there are things you could do to change this. This would be more in the routine based parenting styles which use props, triggers, timings and autonomous comforting.
Then there are all the other parenting styles in between and either side. It's hard to offer advise though because I am not sure what your parenting style is.