Keywords: قرار گرفتن در معرض نیکوتین; Nicotine exposure; Lactation; Hypothalamus; Neuropeptides; Developmental plasticity; ACTH; adrenocorticotropic hormone; AgRP; agouti-related peptide; ARC; arcuate nucleus; C; control group; CART; cocaine and amphetamine-regulated transcript; CRH; corticot