Nancy,
You may already have this but Wallace Downey Jr, born 15 Apr 1879, was baptised in St. Stephens Church of Ireland, Belfast on 30 Apr 1879. At that time his parents lived at 61, Brown Square, Belfast. When Robert was baptised on 28 March 1873 the family lived in Robert Street, Belfast. When each of the other children were baptised the family seem to have had a different address for each.
Regards