Homeopathy for Colds

I have a two-and-a-half week old baby girl who developed a cold I believe. Her nose is clogged and is now interfering with nursing, as she has difficulty breathing. So she does a lot of short nursing sessions, or we have to latch on more than once. The pediatrician says her lungs are fine and that's normal—but she is having a hard time breathing especially at nights. We tried saline solution, sitting her upright, aspirator and nothing comes out, breastmilk dropped in the nose, cold mist humidifiers. She is too young for most alternative solutions I know like ginger and onions. Please help us with any solutions for stuffiness in a baby this young.