According to the Mayo Clinic, your baby's lungs don't fully develop until the end of the third trimester. So a baby born too early can take on some breathing issues as they get older. The March of Dimes noted that asthma and bronchopulmonary dysplasia (BPD) are all possible conditions that can be caused by a premature birth. The latter, BPD, is a chronic lung disease that causes the lungs to grow abnormally or to be inflamed.

According to The Huffington Post, a Finnish study found that young adults who were born prematurely had weaker muscles than peers who were born at full-term. Those people born earlier than 37 weeks also reported that they did not feel as physically fit as their peers, despite the study not finding any evidence of that.

Issues don't just affect a premature baby's health, they can also affect their social skills. A study from Rhode Island found that a premature baby was at risk of developing more social and school struggles later in life than their full-term peers. The March of Dimes noted similar issues, such as long-term intellectual and developmental disabilities like delays and/or issues with learning, communicating with others, and getting along with others.

Heart issues and premature babies often go hand-in-hand, but the complications can continue even as your baby becomes an adult. According to a study in Circulation, adults who were once premature babies are at risk of developing problems surrounding the heart such as cardiac risk factors like high blood pressure.

A child may be born with hearing loss, but Baby Center noted that premature babies can develop hearing loss later on in life because of their low birth weight, abnormal inner ear development, or because of an infection that caused issues later in life.

A common issue in premature babies is necrotizing enterocolitis, a disease that can affect a premature baby's intestines according to the March of Dimes. Although most babies with this disease get better, the scarring and issues can affect them later in life by blocking their intestines and requiring surgery.

Time rounded up nine studies of premature babies and found in their review that one issue was prevalent in all of them — premature babies had an increased risk of developing neurological disorders later in life. According to the March of Dimes, many premature babies often grow up dealing with cerebral palsy.

According to the Mayo Clinic, behavioral problems can be a complication for premature babies, including dealing with ADHD. Additionally, Time noted that premature babies are also at a greater risk of developing anxiety and even autistic features.

Parenting noted that enamel hypoplasia, a condition that leaves teeth lacking enamel protection and more prone to decay and staining, can affect preemies and even affect their adult teeth later in life. Without the enamel, a premature baby's adult teeth may be more prone to cavities and decay.

It's no secret that premature babies are more prone to sickness, but that risk can carry on into adulthood. According to the Mayo Clinic, chronic health issues, infections, and underdeveloped immune systems can all affect a premature baby and leave them more susceptible to illnesses than if they had been born full-term.

The National Eye Institute noted that retinopathy of prematurity, an eye disorder that could potentially cause blindness, primarily affects premature babies. This condition doesn't affect them all, but it can potentially lead to serious vision problems or complete loss of eye sight.