Hi,
Moon is in Aquarius. Dispositor of the Moon is Saturn.Saturn is also the 5th house ruler.
Mars and Jupiter are posited in the 5th and with Saturn in Capricorn.
Aquarius, Saturn, Mars, Jupiter=masculine. Capricorn=feminine.
Masculine overweights here. That's why it will be a boy again.
Same thing with a sidereal zodiac:
Moon in Aquarius. 5th house ruler is Jupiter. Mars and Jupiter in the 5th in Sagittarius.
Aquarius, Sagittarius,Jupiter and Mars are all masculine by nature.
If we would take the 3rd of the 5th for the second child, then the significator is Saturn (masculine) in Capricorn (feminine) for both zodiac signs.If we use the second of the 5th (as Zarya mentioned) it's also Saturn.
Dsc (3rd of 5th) is in Aquarius(masculine), occupied by Moon (feminine), Sun (masculine) and Mercury (neutral) in pisces (feminine).
Because Moon also shows the matter and the querent's mind- and in the 7th house, I think the second child rather is represented by the 7th house, its ruler and the planets posited in that house.
Overall- I say boy