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My son's first word, at almost 6 months old, was "Mama." He didn't say it again for a while, and then it was all "Dada, dada, dada" for another while before "Mama" came back into play, but anytime he did refer to me as anything, it was "Mama" and then "Mommy." Over the past month or two, though, he's started calling me "Jessie." I try to teach him to say and sign "Mommy," and sometimes it works, but other times I spend what feels like forever repeating "Mommy" while he responds with "Jessie." As a stepparent, I would never ask the older kids to refer to me by a name they don't feel comfortable with, and I would never try to supplant their mother. At the same time, this side effect of that really hurts. I worked so hard and went through so much to be able to actually be Mommy to someone, and even while I know how and why it's happening, it still feels like that is being diluted.
(I am really glad that my husband understands how I feel and why and does what he can to reinforce "Mommy" with my son)