I would definitely not be starting her on solids hun. That advice is incorrect. Farex will not do anything for her weight except cause her to take less of the breast, which could lead to early weaning and even weight *loss*, because there is nowhere near as many goodies in Farex as BM. I'd just be upping her breastfeeds and watching her nappies. If her input/output is good I would not be too concerned. She may just be growing at a different rate, or she may just be a petite girl