GR, page 123: Jessica's lamb

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Another one of these things I never caught before in GR.  This is Jessica:

"The images go, flowering, in and out, some lovely, some just awful . . .
but she's snuggled in here with her lamb, her Roger, and how she loves the
line of his neck all at once so-why there it is right there, the back of his
bumpy head like a boy of ten's. [...]"

Why that "lamb"? A religious connotation (which I think doubtful)?

Michel.

(and note the "ten's" which corresponds to Mexico's: "With her hair pulled
back of her ears, her soft chin in profile, she looks only 9 or 10" on p.
122.