Many if not most toddlers and young children outgrow their milk allergy by about the age of 18 months.So your older daughter fits this pattern very closely. She would not be able to tolerate drinking milk now if she has a lactose intolerance.
Your baby is not drinking enough formula per day.She may be 'protecting' herself by not drinking too much of the soya formula due to her probably having become allergic to this formula. Try her on a low allergy cow's milk formula as recommended previously.
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