For this specific purpose it probably does make sense to consider Russia part of Europe. If we go by the common Europe-Asia dividing line of the Ural mountains then a large majority of Russia's population is in the European half, so most Russian births are probably in the European bit

The weird thing about the Americas to me is that only Mexico, the US, and Canada are counted. I don't think I've ever seen anyone that draws a dividing line between North and South America do so anywhere except at the Darien Gap, nor have I seen anyone put all of the Caribbean islands in South America. Iberoamerica or similar cultural region terms, sure, but South America the continent?