First, if you have to go in to get chicks out who are spaced far apart in the hatch, if you have styrofoam 'bator (LG, HovaBator), this trick works to keep the humidity from dipping down:
Wash your hands VERY well with sap & hot water. Get a clean bath towel. Turn on the shower head & spray hot water on the towel till it's pretty damp & starting to drip. Wring it out slightly. Take it in to your 'bator room quickly. Locate the chicks visually before you go in. THen drape the towel over the entire bator, lengthwise, leaving a long length to get yourself under. Put your hands under the hot towel and slip both into the 'bator, keeping the towel over your arms. Grab anything fuzzy you can find, and whisk it out onto your lap or a soft blanket, or your shirt, if you have a tight shirt or a bra to hold you chicks in to keep them warm. ALWAYS close the bator with one hand & check when you take the towel off to make sure it's sealed as tight as before. Your hygrometer(s) should read within 5% of your last humidity reading before opening it. The steam from the wet towel negates the moist air coming out when you put your hands in. This action should have taken 1 second per chick or less. Bantams can be scooped up by touch in 2s & 3s.
I've done this a dozen times & never had subsequent chicks shrink-wrapped or fail to hatch once pipped. Limit it to once, at most twice, per hatch.
Better not to go in at all, however.
If you have a moving-air 'bator & you've kept the huidity around 50% throughout the hatch, 60-65% should be fine, and only above 75% for a long time should you worry.
In a styrofoam 'bator, here again, you can always make an extra hole or two with a pointed object.
Wash your hands VERY well with sap & hot water. Get a clean bath towel. Turn on the shower head & spray hot water on the towel till it's pretty damp & starting to drip. Wring it out slightly. Take it in to your 'bator room quickly. Locate the chicks visually before you go in. THen drape the towel over the entire bator, lengthwise, leaving a long length to get yourself under. Put your hands under the hot towel and slip both into the 'bator, keeping the towel over your arms. Grab anything fuzzy you can find, and whisk it out onto your lap or a soft blanket, or your shirt, if you have a tight shirt or a bra to hold you chicks in to keep them warm. ALWAYS close the bator with one hand & check when you take the towel off to make sure it's sealed as tight as before. Your hygrometer(s) should read within 5% of your last humidity reading before opening it. The steam from the wet towel negates the moist air coming out when you put your hands in. This action should have taken 1 second per chick or less. Bantams can be scooped up by touch in 2s & 3s.
I've done this a dozen times & never had subsequent chicks shrink-wrapped or fail to hatch once pipped. Limit it to once, at most twice, per hatch.
Better not to go in at all, however.
If you have a moving-air 'bator & you've kept the huidity around 50% throughout the hatch, 60-65% should be fine, and only above 75% for a long time should you worry.
In a styrofoam 'bator, here again, you can always make an extra hole or two with a pointed object.