Not being able to have a baby is considered infertility. According to MedlinePlus, infertility is defined as not conceiving a child after one full year of trying frequently. There are many factors that can affect fertility and there are numerous signs that you can’t have a baby.

You might have difficulty telling the difference between your baby's movements and gas bubbles and knowing what to watch for can help you determine which is which.

According to the American Academy of Pediatricians (AAFP), two to three percent of infants are have developmental disabilities. Chromosomal abnormalities, genetic syndromes, birth injuries and environmental factors can cause intellectual disabilities.

Infant males often have swollen testicles. Testicular swelling present at birth may be related to the birth process and vanishes within a few days.

Full-term babies normally come out of the womb ready to breathe on their own, but the way your baby breathes might alarm you at times. Newborns normally breathe faster than older children and adults do. They might also have more irregular breathing patterns.

While you may think your new baby will be born with fresh, smooth and perfect-looking skin, his skin will be sensitive, which makes it prone to many skin imperfections for the first few months of life.

Feeding your baby solid foods can be a daunting task as he experiences new tastes and learns what he likes. Allergic reactions to foods are also an important concern for parents. Food allergens can cause potentially dangerous reactions.

A build up of phlegm, thick mucus produced by your infant's lungs and upper airways, can cause significant distress for your infant. There are numerous causes of increased phlegm production, such as respiratory infection, irritation, lung disease and cystic fibrosis.

It's rare that a baby needs formal exercise and stretching. In fact, if you watch your baby's movements, you'll notice that he stretches and contracts his body naturally while sleeping and during his alert times throughout the day.

Your baby may not be able to speak yet, but as her parent, you are the expert on what her voice sounds like. If her cries and babbles begin to sound strained and raspy and you can hear gurgles and wetness in her chest, don't hesitate to call the pediatrician.

If you're breastfeeding, you probably prefer to avoid taking unnecessary medications that could pass through your breast milk to your baby. If you develop an earache, your doctor may prescribe antibiotics if you have an ear infection. Ear pain doesn't always indicate an ear infection, however.

As your baby gets older, you might be surprised to see her in constant motion, even before she can roll over or crawl. Babies learn about the world around them by moving their body and interacting with their environment. Your baby's arm movements can tell you important things about what she is experiencing.