Familysearch pilot site shows at least 4 children for this couple:
James bp.7/11/1819 Mildenhall, son of Henry and Elizabeth Frost
Sarah bp.19/11/1820 Mildenhall, dau. ditto
Robert bp.2/11/1823 Mildenhall, son ditto
Eliza bp.11/2/1827 Mildenhall, dau. ditto
Annette