19 month old with eczema and low weight gain

My son turned 19 months,he was born 3 days late,
normal delivery (by induction). My pregnancy was quite ok except that
throughout I suffered from hay fever and in mid pregnancy had mild
anemia which was treated with iron tablets(pregaday)
Since birth, he had very dry skin for which we only used emollients
moisturizers but never used any soaps, shampoo or scented products. He
also had infant jaundice, which was cured own its own. When he was 2
months, my GP confirmed that he has mild eczema. Since then I have
been using on and off mild steroids (hrdro-crotozone and elocon) . His
eczema is mostly on his face, arms (joints) , Legs(mostly around
thigh) and very itchy at night with large dry patches. Eczema mostly
get flared- up when weather is changing or when its too hot or too
cold. When its flared, its mostly red and very dry which leads to wet
watery discharge and then cracked skin that causes infection. In Feb,
he had antibiotic course for infected skin.
he is also very underweight ( 9.8 kg only) though he was born with 8
pounds weight. He was never interested in his feeds, I breast fed him
with combination of formula until he was 6 months. Still now, he is a
very poor eater, hardly ever interested in his food though he drinks
his milk (cow milk) ok now.
By nature, mostly very cranky, adamant and gets irritated very
quickly. When outside, very social , really likes to show off . He is
also very poor sleeper at night, sometimes wakes up up to 20 times,
crying for comfort or milk.
In December 2008, I started giving him homeopathic medicine from our
local doctor. He was given Psoronium 30, 4 tabs daily for some days
then put him on Alumina 6, 4 tabs twice a day along with Comp 4 tabs
daily....during that period (Dec- March) I hardly used steroid . His
eczema was quite bad and sour for 2 months then started settling
gradually but never went away completely . In March , his medicine was
discontinued because doctor went to India for 2 -3 months.
In desperation I took him to another homeopath because of bad flare-up.
He was given 2 weeks medicine ;
Biochemi , Tissur salt, Thuja, Alfa comp and crotin comp. (Twice a
day, Powder once a week) gave that medicine for 2 mnths without any positive results . I Now I am again using steroid twice a week,
I think, he is quite behind in terms of physical development started walking at 16 months n he has only 5 teeth.I would really appreciate, If
I can get some help from you.