Bath time on a blocked-up night is doing two jobs at once: getting a kid clean, and getting some eucalyptus into the steam.
Two products, one bottle: A sudsy bubble bath and a body wash in the same 10 fl oz bottle. Squeeze it into running water for bubbles, or into a hand or washcloth to wash hair and body.
The eucalyptus: Made with natural eucalyptus essential oil. Warm water carries the scent up out of the tub. A bath is often the first move when a nose is blocked.
The formula: Hypoallergenic, dye-free, phthalate-free. Developed with dermatologists for skin prone to irritation.
Ages: Fridababy describes it as suitable from the very first bath through the toddler years. No numeric age gate is published for it.
How much per bath: Not published. Start with a small squeeze and add more if you want a deeper layer of bubbles.
Afterward: Rinse the lather off properly at the end of the bath. Do not leave suds to dry on skin. Cap the bottle between baths.
If bedtime is the problem you are solving and not congestion, the lavender version of this wash is the same idea with a different oil.