Can a three-and-a-half-month-old baby who weighs 12 pounds start on solid food?

Patient's question:

The baby is three and a half months old and weighs less than 12 pounds, she is lean, and breastfeeding is not enough. She completely refuses to drink from a bottle. Can I wait until she is four months old to start complementary feeding? I really can't bear to force her to drink from a bottle. After adding complementary foods, how should I still add formula?

Doctor's answer:

The baby is three and a half months old, slightly underweight, and breastfeeding is not enough. The baby completely refuses to drink from a bottle. If it is indeed insufficient milk intake, this situation still needs to be addressed by adopting a mixed feeding method.
At three months, a male baby weighs 5.0-6.9 kg, and a female baby weighs 4.7-6.2 kg. The formula for weight calculation is: (age in months)^3.5 × 3 + birth weight. Based on this, the weight has already fully met the standard, and complementary foods can be gradually introduced from 4 to 6 months.
Sometimes, insufficient milk supply is just an illusion, and there is no need to provide formula too early.

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