The firm says it is making more of its product than ever before but faced 'phenomenal demand'.
Rachael Blenkinsop, a mother of 10-month-old twins from Seaham, County Durham, said she had struggled to find popular Kendamil products in shops in recent weeks.
Will McMahon, co-founder of the Cumbria-based company, said it was dealing with "phenomenal demand" and bottlenecks in its production line were being addressed.
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