Our expert says:
A child psyciatrist or psychologist would be best placed to asess the child an clarify what has changed. Generally, this sort of sleep disturbance, especially when combined with "belly-aching", suggests that the child is bothered, disturbed by something worrying him, and even though you are trying to give him special attention, the arrival of a sibling can cause such difficulties - she is a rival, and changes the whole shape of his world, and he feels insecure about that
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