my toddler doesn't love me anymore

he is 2 years and 7 months and he has always been mamas boy except about 1 month ago when I had a baby, he used to call me for everything now he refuses to do anything with me, he doesn't want me to put him to sleep.or to carry him, he used to get exited when I picked him up day care and now he doesn't. he even told me today * I want daddy to pick me up* my heart is broken in million pieces. has anyone been through this? is this phase? will he hate me forever? I feel like I can't take this pain