It's National Siblings Day! Here's what you need to know

By Amanda Jackson, CNN

Updated 11:08 AM ET, Wed April 10, 2019

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CNN invited readers last year to share photos of children with their new siblings. Here, Cecelia, 2, meets baby Sullivan. "Cece is very possessive of her little brother. 'He's mine' or 'my brother' or 'my Sully' are her favorite things to say to strangers when we are out together in public." -- <a href="http://ireport.cnn.com/docs/DOC-1231966">Cary Chadwick</a>, Higganum, Connecticut
Photos: Kids meeting their baby siblings
Hello, baby! – CNN invited readers last year to share photos of children with their new siblings. Here, Cecelia, 2, meets baby Sullivan. "Cece is very possessive of her little brother. 'He's mine' or 'my brother' or 'my Sully' are her favorite things to say to strangers when we are out together in public." -- Cary Chadwick, Higganum, Connecticut
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"This was my husband's first day back at work and my first day alone with two babies under 2. Overwhelmed didn't even begin to describe how I was feeling. It was 2 p.m. and I was finally getting around to brushing my teeth, so I laid Nora in my bed. When I came out of the bathroom, Jack had climbed up into the bed with her." -- <a href="http://ireport.cnn.com/docs/DOC-1231662">Emily Thomas</a>, Marietta, Georgia
Photos: Kids meeting their baby siblings
Jack, 2, and baby Nora – "This was my husband's first day back at work and my first day alone with two babies under 2. Overwhelmed didn't even begin to describe how I was feeling. It was 2 p.m. and I was finally getting around to brushing my teeth, so I laid Nora in my bed. When I came out of the bathroom, Jack had climbed up into the bed with her." -- Emily Thomas, Marietta, Georgia
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"We worried that since the first one was still basically a baby herself, she'd be jealous about the new baby crowding her turf. Luckily, they've been best buds since their first meeting." -- <a href="http://ireport.cnn.com/docs/DOC-1232272">Andrea Jones</a>, Atlanta, Georgia
Photos: Kids meeting their baby siblings
Abigail, 11 months, meets baby Caroline – "We worried that since the first one was still basically a baby herself, she'd be jealous about the new baby crowding her turf. Luckily, they've been best buds since their first meeting." -- Andrea Jones, Atlanta, Georgia
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"My wife and I were worried how he would react to having a baby sister. We had our baby girl Emma on February 28. She is beautiful, but is a little colicky. The first thing my son did when we came home was put his hands out to hold her." -- <a href="http://ireport.cnn.com/docs/DOC-1232344">Michael Galarza</a>, Staten Island, New York
Photos: Kids meeting their baby siblings
Mikey, 17 months, and baby Emma – "My wife and I were worried how he would react to having a baby sister. We had our baby girl Emma on February 28. She is beautiful, but is a little colicky. The first thing my son did when we came home was put his hands out to hold her." -- Michael Galarza, Staten Island, New York
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"My son had been born at home at 4 a.m. while Julia was sleeping in the front bedroom. My husband brought her in when she woke up and she immediately kissed her baby brother. ... Then she couldn't stop staring in amazement at him." -- <a href="http://ireport.cnn.com/docs/DOC-1231634">Jennifer Prescott</a>, Tustin, California
Photos: Kids meeting their baby siblings
Julia, 17 months, meets baby Willy – "My son had been born at home at 4 a.m. while Julia was sleeping in the front bedroom. My husband brought her in when she woke up and she immediately kissed her baby brother. ... Then she couldn't stop staring in amazement at him." -- Jennifer Prescott, Tustin, California
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"Our oldest daughter was less than thrilled when meeting her baby sister for the first time. ... I can only imagine what was going through Tenny's mind." -- <a href="http://ireport.cnn.com/docs/DOC-1231761">Andrea Brown</a>, Tulsa, Oklahoma
Photos: Kids meeting their baby siblings
Tennyson, 18 months, meets baby Marlowe – "Our oldest daughter was less than thrilled when meeting her baby sister for the first time. ... I can only imagine what was going through Tenny's mind." -- Andrea Brown, Tulsa, Oklahoma
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"The first few days he would cry and scream, 'I don't want Mommy to hold baby Brody!' He still has his moments, but he's accepted that Brody is sticking around." -- Sarah Hager, Louisville, Kentucky
Photos: Kids meeting their baby siblings
Hudson, 2½, and baby Brody – "The first few days he would cry and scream, 'I don't want Mommy to hold baby Brody!' He still has his moments, but he's accepted that Brody is sticking around." -- Sarah Hager, Louisville, Kentucky
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"Chloe loves giving hugs and kisses to Caleb. She's also the first one to jump in and console Caleb when he is upset. ... Although there's a big age gap between them, I think Chloe will always be a nurturing big sister." -- <a href="http://ireport.cnn.com/docs/DOC-1232038">Marie Cabanlig</a>, Burnaby, British Columbia
Photos: Kids meeting their baby siblings
Chloe, 8, and baby Caleb – "Chloe loves giving hugs and kisses to Caleb. She's also the first one to jump in and console Caleb when he is upset. ... Although there's a big age gap between them, I think Chloe will always be a nurturing big sister." -- Marie Cabanlig, Burnaby, British Columbia
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"Brooklyn was very interested in her, and he would look deep into her eyes." -- <a href="http://ireport.cnn.com/docs/DOC-1232104">Brad Beard</a>, Vestavia, Alabama
Photos: Kids meeting their baby siblings
Brooklyn, 2, meets baby Jaclyn – "Brooklyn was very interested in her, and he would look deep into her eyes." -- Brad Beard, Vestavia, Alabama
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"She was a real live baby doll as far as my oldest was concerned. She thought she was so cute and would have lots of dresses." -- <a href="http://ireport.cnn.com/docs/DOC-1231643">Katie OBrien</a>, Glens Falls, New York
Photos: Kids meeting their baby siblings
Jillian, 6 meets baby Madelyn – "She was a real live baby doll as far as my oldest was concerned. She thought she was so cute and would have lots of dresses." -- Katie OBrien, Glens Falls, New York
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"A half-hour later, Jaden was still just staring at her, just as she is in the picture, mesmerized. Every so often she would reach down and touch Lilly-Belle's hair in pure amazement." -- <a href="http://ireport.cnn.com/docs/DOC-1231986">Mike Bernstein</a>, Charlotte, North Carolina
Photos: Kids meeting their baby siblings
Jaden, 2, meets baby Lillian Belle &nda