Would like a constitutional remedy for 2 year old

Hello, I looking for a constitutional remedy for our two year old. Also, do babies need constitutional remedies? We have a two month old as well that had a very bad cold not long ago, he got it the worst out of our whole family.
As for the two year old, here is a variety of things about him that bother me.
Allergies. This past summer, he developed outdoor allergies for the first time. We moved from WA to Alaska a year ago, and so this summer was his first exposure to fireweed. When it went to seed on the fall, he had a bad respiratory illness (I thought at the time). The coughing got worse where he would go into constant coughing fits, eyes watering, hard to catch his breath, sounding a bit wheezy, sneezing occasionally. Did antibiotics, nebulizer, inhaler, steroids, and none helped much. What finally worked were children's allergy meds. It helped right away. His symptoms subsided as the winter set in, but I worry for next year. He always seems to be prone to lung illnesses---if the family gets sick, he tends to take longer to recover from the lung aspect of of it.
Soft stools. Has always been like that. I worry for potty training that it may be difficult unless he can get more firm stools.
Dry skin. Doctor always comments on this. He also has a few bumps on arms and legs, not red, but like a clogged pore or something. At birth, he had on his left arm two little clogged sebaceous glands. It almost looked like two tiny puncture marks.
Small appetite. He did not even want solid food until almost a year old, and even then has always eaten "like a bird". He snacks all day long, likes crunchy carbs primarily, but will eat a little bit of fruit and protein. He also really likes noodles with Alfredo sauce. Refuses milk in a glass. Pretty much only drinks water since I rarely ever give him juice because it just makes his stools more watery.
Other things that describe his personality/likes/dislikes.
He is a bit quiet, yet will be very vocal at a perceived slight or threat of his favorite toy being taken by his brother. When things don't turn out the way he wants, he can get himself worked way up with loud crying and tears and be very distraught about it. Otherwise he is fun-loving, mostly obedient, smart, imaginative/creative, and a good kid in general.
He tends to be anxious about some things. I was very very anxious while pregnant with him, because of a previous miscarriage, and I feel that my anxiety affected him. He will tell me to be careful when using a sharp knife, to watch my toes when I shut the basement trap-door, to watch out and not fall when I'm going down the stairs, etc. He does warn his older brother about some things as well.
He seems conscientious about the little details in life. He doesn't care really if his toys are all over the floor, but will burst into tears if one of them is broken. He goes behind me and shuts cupboard doors if I leave them open for longer than he thinks is necessary. He has strong opinions about how things should be done. Yet very loving and snuggly. Can be the "quiet one" when it comes to his needs, sometimes I have to make sure to listen extra closely to him to make sure he isn't lost in the shuffle.
He is more on the lean side, about 15th to 20th percentile for weight and height for his age. Belly protrudes somewhat.
He has a slight kidney abnormality on the left side, I believe it is a partially duplicated ureter. I have fully duplicated utters on both sides and duplex kidneys as well, so this was inherited. It has never needed any intervention. He had one testicle that did not descend, left side as well, and when they repaired that surgically at 9 months they found multiple hernias, inguinal and others perhaps? Not sure on that. They were all down low in the pelvic region. Those were repaired as well.
He was a very fussy baby and a very poor sleeper, waking about 5-8 times a night for the first 10 months or so of life. He didn't sleep through the night until a few months ago, and still wakes on occasion crying or needing comfort. His older brother was just as bad as a baby, and I myself was a terrible sleeper and a very fussy baby, presumably due to the kidney issues.