Well, here in Ireland they recommend starting at 6months if the baby is EBF and between 4 and 6 when FF. But the public health nurse always said "she'll let you know when she is ready". And since DD wasn't EBF anymore, I decided to give it a try when she turned 4 months (few days ago) because it might help her with the weight gain (she had slow weight and got sick, losing some precious grams as well...).
She's absolutely loving it! I mean, she doesn't sit unsupported yet, although she has a very good head control and is trying to sit up on her own but she's very into it. I think on the very first day she still had the thrust reflex but now (after 4 days) she already knows that to do with the spoon (and the food!)