At four months old, babies can roll over, laugh loudly, and start to eat their hands and grab things. They put everything in their hands into their mouths and shout loudly or mutter softly, as if talking to themselves.
When a baby refuses to drink formula milk, it may be due to an attachment to breast milk. Since the baby is currently being breastfed exclusively, it may find it difficult to accept other milk products. In this situation, it is appropriate to gradually introduce complementary foods, starting with rice cereal, egg yolks, and fruit purees, and then gradually transitioning to vegetable and meat congee, soft noodles, etc. Once the baby’s taste adapts, they will gradually accept the taste of formula milk. It can be tried to increase the amount of formula milk in small increments. Additionally, changes in weather may also affect the baby’s appetite, so some complementary foods can be introduced, and warmth should be ensured.