What can i take for a sinus cold while breastfeeding? i've been taking tylenol (acetaminophen) sinus and cold is it okay to take breastfeeding

Yes: Your medication should be ok. If you have a sinus infection with thick stringy mucous , the homeopathic remedy kali bichromicum will also help immensely and is completely safe to take while breatfeeding.

May decrease milk: While it is safe to take that medication, just like it can dry up the mucous in your nose, it can dry up your milk production as well. I recommend local/topical treatment like a nasal spray such as afrin, humidity, nasal saline drops, or warm/steamy beverages such as teas. Also make sure to get plenty of fluids yourself - both to keep mucous thin and ensure your milk supply.