I've been looking around a bit, and... yeah, really I have found NO official information on Lalafell children/childhood/child-rearing/etc. We have a couple characters with Lalafell models labeled "starving children" or something, but that could just be a bit of laziness... or is it confirmed that Lalafell kids look exactly the same and have the same size as Lalafell adults?!
I like the lore of the series, and I think it would be interesting to find out about this aspect of it. I would also like to find out more about Roe children, but they're more human-ish so I can kind of guess where that's concerned.