I would say put yourself in a child's shoes. Imagine you have all the attention for 2 years and then suddenly the attention is turned towards your little sister. It is a major and sudden change to your son with the new addition at home. This is how your son is feeling. He is only 2 yrs old and he may not understand what you are trying to explain and does not know how to express himself well. It is also not advisable to scold him as he may feel that "mummy doesn't love me anymore." This is where your husband needs to play a part and spend more time with him since you will be busier with the little one. When time permits, your husband should bring your son out (just the two of them) and let them spend time together, so that he doesn't feel left out. It will take months before he start accepting the new family member.
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