My 2nd baby is at terrible 2 stage now too. What I do is to make sure I stay close to him whenever he is throwing tantrums as he can't regulate his own emotions yet. If I need to carry him, I will carry him by sitting down or lie with him together on bed. Apart from carrying your first born, you can plan some activities for your son to do with your wife e.g. art and craft which does not require a lot of energy and strength during pregnancy, at the same time to have bonding between your wife and son.
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