Aspects of this topic are discussed in the following places at Britannica.
...the Baptist appear as intercessors on either side of Christ. In addition to these rather ceremonial types, the Virgin also appears in the less-frequently represented, more intimate types of the galaktotrophousa, in which she nurses the Child, and the glykophilousa, in which the Child caresses her cheek while she seems sadly to contemplate his coming Passion.
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