In looking at your application, you hardly need anything "high end." My suggestion is an inexpensive monoprice 25watt or 50watt hybrid tube integrated. Plenty there from either to drive a pair of bookshelf speakers and provide music to a help relax a young child. And they both sound surprisingly good.
And if they don't work out, you haven't invested much to find out.
And if they don't work out, you haven't invested much to find out.