I have been contending with a viral infection for this past week plus (I suspect covid but we don't test for it anymore it seems) and have perforce had to leave my novice young broody Fez to get on with it without assistance.
On the day I was going downhill fast she seemed to have half-abandoned a chick that had been struggling to keep up the previous 2 days, and I realized that I was not going to be able to intervene much longer, so I did what I thought was the decent thing in the circumstances: I brought it in to a calm, quiet and warm place and simultaneously freed Fez from dividing her energies between teaching the curious and busy majority and responding and returning to the plaintiff cheeps of the one. It passed later that day. RIP Gilfach, probably one of her own, and the one of whom I captured the tenderest moment a few days prior.
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Now my energy levels are recovering, I find that Cadoc, the chestnut brown one, is limping; I have no idea what happened or when during the week, but it doesn't want to put weight on the left leg. S/he is keeping up, by bunny hopping if speed is needed, but it looks significantly smaller and less well developed than its similar-size-egg siblings, which are the nearer 2 of the other 3 in this photo (2 of the 6 eggs were about 20% larger than the other 4, so those 2 chicks are naturally bigger too; one of those is the chick at the back (Sully), and one (Erddig) is off-camera).
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Fez has not given up on it, at least not yet. For a novice young broody who's essentially had to go it alone after the first week, I think she's done brilliantly. Hopefully I'll be able to support her rather better henceforth.
Sorry to hear about the viral infection you've been going through (whether covid or otherwise), Perris

Sorry to hear the loss of Gilfach, but you were doing the kindest thing you could, by giving him/her a safe and calm place to pass