Tired with only one baby

So I was told today in as many words that it was ridiculous for me to be tired because I only have one baby.  My question isn't whether or not this person is an ass. She and I both know she was being a bitch even if she won't admit it. But worst of all I think she might be right. Is it ridiculous for me to be exhausted as a stay at home mom of only one 4 month old baby. Maybe I am not cut out for this. Should I not have any more kids in your opinion? 

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