Definition of "nestling"

the secrecies of the passages, and the seats or nestlings of the humours

1605, Francis Bacon, “(please specify |book=1 or 2)”, in The Twoo Bookes of Francis Bacon. Of the Proficience and Aduancement of Learning, Diuine and Humane, London: […] [Thomas Purfoot and Thomas Creede] for Henrie Tomes, […]

I certainly was not prepared for the cosy nestling valleys that snuggled against the shoulders of the hills; a land where the graystone cottages and farmsteads still prevailed, but where they had taken on something of the softness of their kind in Gloucester and the Cotswolds, and seemed almost like growths of the soil; […] .

1949 January and February, F. G. Roe, “I Saw Three Englands–1”, in Railway Magazine, page 12

It was associated, to them, with vague sweet memories of loving nestlings in mother's arms, of soft warm coddlings before the fire, of slow rocking to and fro in the little, low, flag chair, and gradual droppings off to sleep […]

1871, Kate Neely Hill Festetits, Actions speak louder than words